Committing.

Source code/Clean-solution.ps1

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+# Copyright © 2016–2017, 2019 eMedia Intellect.
+
+# This file is part of eMI User Controls Library.
+
+# eMI User Controls Library is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# eMI User Controls Library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with eMI User Controls Library. If not, see http://www.gnu.org/licenses/.
+
+###################################################
+# Solution cleaning for eMI User Controls Library #
+###################################################
+
+Write-Host '┌─────────────────────────────────────────────────┐'
+Write-Host '│ Solution cleaning for eMI User Controls Library │'
+Write-Host '└─────────────────────────────────────────────────┘'
+Write-Host
+
+Write-Host 'Removing the Visual Studio solution user options directory.'
+Write-Host
+
+Remove-Item -ErrorAction 'Ignore' -Force -Path '.\.vs' -Recurse
+
+Write-Host 'Removing the builds.'
+Write-Host
+
+Remove-Item -ErrorAction 'Ignore' -Force -Path '.\CloseableTabItem\Build' -Recurse
+Remove-Item -ErrorAction 'Ignore' -Force -Path '.\CloseableTabItemTesting\Build' -Recurse
+Remove-Item -ErrorAction 'Ignore' -Force -Path '.\FileSystemBrowserWindow\Build' -Recurse
+Remove-Item -ErrorAction 'Ignore' -Force -Path '.\FileSystemBrowserWindowTesting\Build' -Recurse

Source code/CloseableTabItem/Classes/CloseableHeader.xaml

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+<!--
+Copyright © 2016–2017, 2019 eMedia Intellect.
+
+This file is part of eMI User Controls Library.
+
+eMI User Controls Library is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+eMI User Controls Library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with eMI User Controls Library. If not, see http://www.gnu.org/licenses/.
+-->
+<UserControl x:Class="Emi.UserControls.CloseableHeader" x:ClassModifier="internal" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+	<UserControl.Resources>
+		<ControlTemplate TargetType="{x:Type Button}" x:Key="ButtonTemplate">
+			<ContentPresenter Content="x"/>
+		</ControlTemplate>
+	</UserControl.Resources>
+	<Grid>
+		<Label FontFamily="Courier" HorizontalAlignment="Left" Margin="0, 1, 0, 0" Padding="0" x:Name="titleLabel"/>
+		<Button FontFamily="Courier" FontSize="13" FontWeight="Bold" Foreground="#A7A5A5" HorizontalAlignment="Right" Margin="0, 0, 0, 0" Name="closeButton" Template="{StaticResource ButtonTemplate}"/>
+	</Grid>
+</UserControl>

Source code/CloseableTabItem/Classes/CloseableHeader.xaml.cs

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+// <author>Stefán Örvar Sigmundsson</author>
+// <copyright company="eMedia Intellect" file="CloseableHeader.xaml.cs">
+//    Copyright © 2016–2017, 2019 eMedia Intellect.
+// </copyright>
+// <licence>
+//    This file is part of eMI User Controls Library.
+//
+//    eMI User Controls Library is free software: you can redistribute it and/or modify
+//    it under the terms of the GNU General Public License as published by
+//    the Free Software Foundation, either version 3 of the License, or
+//    (at your option) any later version.
+//
+//    eMI User Controls Library is distributed in the hope that it will be useful,
+//    but WITHOUT ANY WARRANTY; without even the implied warranty of
+//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+//    GNU General Public License for more details.
+//
+//    You should have received a copy of the GNU General Public License
+//    along with eMI User Controls Library. If not, see http://www.gnu.org/licenses/.
+// </licence>
+
+namespace Emi.UserControls
+{
+	using System.Windows.Controls;
+
+	/// <summary>Provides a closeable header for the <see cref="CloseableTabItem"/> class.</summary>
+	internal partial class CloseableHeader : UserControl
+	{
+		/// <summary>Initialises a new instance of the <see cref="CloseableHeader"/> class.</summary>
+		internal CloseableHeader()
+		{
+			this.InitializeComponent();
+
+			this.closeButton.ToolTip = UserControls.Resources.ToolTip.Close;
+		}
+	}
+}

Source code/CloseableTabItem/Classes/CloseableTabItem/CloseableTabItem.cs

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+// <author>Stefán Örvar Sigmundsson</author>
+// <copyright company="eMedia Intellect" file="CloseableTabItem.cs">
+//    Copyright © 2016–2017, 2019 eMedia Intellect.
+// </copyright>
+// <licence>
+//    This file is part of eMI User Controls Library.
+//
+//    eMI User Controls Library is free software: you can redistribute it and/or modify
+//    it under the terms of the GNU General Public License as published by
+//    the Free Software Foundation, either version 3 of the License, or
+//    (at your option) any later version.
+//
+//    eMI User Controls Library is distributed in the hope that it will be useful,
+//    but WITHOUT ANY WARRANTY; without even the implied warranty of
+//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+//    GNU General Public License for more details.
+//
+//    You should have received a copy of the GNU General Public License
+//    along with eMI User Controls Library. If not, see http://www.gnu.org/licenses/.
+// </licence>
+
+namespace Emi.UserControls
+{
+	using System.Windows;
+	using System.Windows.Controls;
+	using System.Windows.Input;
+
+	/// <summary>Provides a closeable tab item for the <see cref="System.Windows.Controls.TabControl"/> class.</summary>
+	public partial class CloseableTabItem : TabItem
+	{
+		/// <summary>Indicates whether the tab item is closeable.</summary>
+		/// <remarks>The store for the <see cref="IsCloseable"/> property.</remarks>
+		private bool isCloseable = true;
+
+		/// <summary>The closeable header of the tab item.</summary>
+		private CloseableHeader closeableHeader = new CloseableHeader();
+
+		/// <summary>The title to display in the header of the tab item.</summary>
+		/// <remarks>The store for the <see cref="Title"/> property.</remarks>
+		private string title = null;
+
+		/// <summary>Initialises a new instance of the <see cref="CloseableTabItem"/> class.</summary>
+		public CloseableTabItem()
+		{
+			this.closeableHeader.titleLabel.Content = this.title;
+
+			if (!this.IsSelected)
+			{
+				this.closeableHeader.closeButton.Visibility = Visibility.Hidden;
+			}
+
+			if (this.isCloseable)
+			{
+				this.Header = this.closeableHeader;
+			}
+			else
+			{
+				this.Header = this.title;
+			}
+
+			this.closeableHeader.closeButton.Click += new RoutedEventHandler(this.CloseButton_Click);
+			this.closeableHeader.closeButton.MouseEnter += new MouseEventHandler(this.CloseButton_MouseEnter);
+			this.closeableHeader.closeButton.MouseLeave += new MouseEventHandler(this.CloseButton_MouseLeave);
+			this.closeableHeader.titleLabel.SizeChanged += new SizeChangedEventHandler(this.TitleLabel_SizeChanged);
+		}
+	}
+}

Source code/CloseableTabItem/Classes/CloseableTabItem/Methods/CloseButton_Click.cs

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+// <author>Stefán Örvar Sigmundsson</author>
+// <copyright company="eMedia Intellect" file="CloseButton_Click.cs">
+//    Copyright © 2016–2017, 2019 eMedia Intellect.
+// </copyright>
+// <licence>
+//    This file is part of eMI User Controls Library.
+//
+//    eMI User Controls Library is free software: you can redistribute it and/or modify
+//    it under the terms of the GNU General Public License as published by
+//    the Free Software Foundation, either version 3 of the License, or
+//    (at your option) any later version.
+//
+//    eMI User Controls Library is distributed in the hope that it will be useful,
+//    but WITHOUT ANY WARRANTY; without even the implied warranty of
+//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+//    GNU General Public License for more details.
+//
+//    You should have received a copy of the GNU General Public License
+//    along with eMI User Controls Library. If not, see http://www.gnu.org/licenses/.
+// </licence>
+
+namespace Emi.UserControls
+{
+	using System.Windows;
+	using System.Windows.Controls;
+
+	/// <content>Contains the <see cref="CloseButton_Click"/> method.</content>
+	public partial class CloseableTabItem
+	{
+		/// <summary>Removes the tab item from the tab control when the close button is clicked.</summary>
+		/// <param name="sender">The sender object of the event handler.</param>
+		/// <param name="e">The state information of the event handler.</param>
+		private void CloseButton_Click(object sender, RoutedEventArgs e)
+		{
+			((TabControl)this.Parent).Items.Remove(this);
+		}
+	}
+}

Source code/CloseableTabItem/Classes/CloseableTabItem/Methods/CloseButton_MouseEnter.cs

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+// <author>Stefán Örvar Sigmundsson</author>
+// <copyright company="eMedia Intellect" file="CloseButton_MouseEnter.cs">
+//    Copyright © 2016–2017, 2019 eMedia Intellect.
+// </copyright>
+// <licence>
+//    This file is part of eMI User Controls Library.
+//
+//    eMI User Controls Library is free software: you can redistribute it and/or modify
+//    it under the terms of the GNU General Public License as published by
+//    the Free Software Foundation, either version 3 of the License, or
+//    (at your option) any later version.
+//
+//    eMI User Controls Library is distributed in the hope that it will be useful,
+//    but WITHOUT ANY WARRANTY; without even the implied warranty of
+//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+//    GNU General Public License for more details.
+//
+//    You should have received a copy of the GNU General Public License
+//    along with eMI User Controls Library. If not, see http://www.gnu.org/licenses/.
+// </licence>
+
+namespace Emi.UserControls
+{
+	using System.Windows.Input;
+	using System.Windows.Media;
+
+	/// <content>Contains the <see cref="CloseButton_MouseEnter"/> method.</content>
+	public partial class CloseableTabItem
+	{
+		/// <summary>Changes the colour of the close button when the mouse enters (hovers over) the close button.</summary>
+		/// <param name="sender">The sender object of the event handler.</param>
+		/// <param name="e">The state information of the event handler.</param>
+		private void CloseButton_MouseEnter(object sender, MouseEventArgs e)
+		{
+			this.closeableHeader.closeButton.Foreground = Brushes.Red;
+		}
+	}
+}

Source code/CloseableTabItem/Classes/CloseableTabItem/Methods/CloseButton_MouseLeave.cs

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+// <author>Stefán Örvar Sigmundsson</author>
+// <copyright company="eMedia Intellect" file="CloseButton_MouseLeave.cs">
+//    Copyright © 2016–2017, 2019 eMedia Intellect.
+// </copyright>
+// <licence>
+//    This file is part of eMI User Controls Library.
+//
+//    eMI User Controls Library is free software: you can redistribute it and/or modify
+//    it under the terms of the GNU General Public License as published by
+//    the Free Software Foundation, either version 3 of the License, or
+//    (at your option) any later version.
+//
+//    eMI User Controls Library is distributed in the hope that it will be useful,
+//    but WITHOUT ANY WARRANTY; without even the implied warranty of
+//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+//    GNU General Public License for more details.
+//
+//    You should have received a copy of the GNU General Public License
+//    along with eMI User Controls Library. If not, see http://www.gnu.org/licenses/.
+// </licence>
+
+namespace Emi.UserControls
+{
+	using System.Windows.Input;
+	using System.Windows.Media;
+
+	/// <content>Contains the <see cref="CloseButton_MouseLeave"/> method.</content>
+	public partial class CloseableTabItem
+	{
+		/// <summary>Changes the colour of the close button when the mouse leaves (hovers off) the close button.</summary>
+		/// <param name="sender">The sender object of the event handler.</param>
+		/// <param name="e">The state information of the event handler.</param>
+		private void CloseButton_MouseLeave(object sender, MouseEventArgs e)
+		{
+			this.closeableHeader.closeButton.Foreground = new SolidColorBrush(Color.FromRgb(167, 165, 165));
+		}
+	}
+}

Source code/CloseableTabItem/Classes/CloseableTabItem/Methods/OnMouseEnter.cs

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+// <author>Stefán Örvar Sigmundsson</author>
+// <copyright company="eMedia Intellect" file="OnMouseEnter.cs">
+//    Copyright © 2016–2017, 2019 eMedia Intellect.
+// </copyright>
+// <licence>
+//    This file is part of eMI User Controls Library.
+//
+//    eMI User Controls Library is free software: you can redistribute it and/or modify
+//    it under the terms of the GNU General Public License as published by
+//    the Free Software Foundation, either version 3 of the License, or
+//    (at your option) any later version.
+//
+//    eMI User Controls Library is distributed in the hope that it will be useful,
+//    but WITHOUT ANY WARRANTY; without even the implied warranty of
+//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+//    GNU General Public License for more details.
+//
+//    You should have received a copy of the GNU General Public License
+//    along with eMI User Controls Library. If not, see http://www.gnu.org/licenses/.
+// </licence>
+
+namespace Emi.UserControls
+{
+	using System.Windows;
+	using System.Windows.Input;
+
+	/// <content>Contains the <see cref="OnMouseEnter"/> method.</content>
+	public partial class CloseableTabItem
+	{
+		/// <summary>Makes the close button visible when the mouse enters (hovers over) the closeable tab item.</summary>
+		/// <param name="e">The state information of the event handler.</param>
+		protected override void OnMouseEnter(MouseEventArgs e)
+		{
+			base.OnMouseEnter(e);
+
+			this.closeableHeader.closeButton.Visibility = Visibility.Visible;
+		}
+	}
+}

Source code/CloseableTabItem/Classes/CloseableTabItem/Methods/OnMouseLeave.cs

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+// <author>Stefán Örvar Sigmundsson</author>
+// <copyright company="eMedia Intellect" file="OnMouseLeave.cs">
+//    Copyright © 2016–2017, 2019 eMedia Intellect.
+// </copyright>
+// <licence>
+//    This file is part of eMI User Controls Library.
+//
+//    eMI User Controls Library is free software: you can redistribute it and/or modify
+//    it under the terms of the GNU General Public License as published by
+//    the Free Software Foundation, either version 3 of the License, or
+//    (at your option) any later version.
+//
+//    eMI User Controls Library is distributed in the hope that it will be useful,
+//    but WITHOUT ANY WARRANTY; without even the implied warranty of
+//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+//    GNU General Public License for more details.
+//
+//    You should have received a copy of the GNU General Public License
+//    along with eMI User Controls Library. If not, see http://www.gnu.org/licenses/.
+// </licence>
+
+namespace Emi.UserControls
+{
+	using System.Windows;
+	using System.Windows.Input;
+
+	/// <content>Contains the <see cref="OnMouseLeave"/> method.</content>
+	public partial class CloseableTabItem
+	{
+		/// <summary>Makes the close button invisible when the mouse leaves (hovers off) the closeable tab item.</summary>
+		/// <param name="e">The state information of the event handler.</param>
+		protected override void OnMouseLeave(MouseEventArgs e)
+		{
+			base.OnMouseLeave(e);
+
+			if (!this.IsSelected)
+			{
+				this.closeableHeader.closeButton.Visibility = Visibility.Hidden;
+			}
+		}
+	}
+}