From 3c2dfca17dd757823024043537f1093ac4c4edc0 Mon Sep 17 00:00:00 2001
From: mvschmaedeck <mauricio.schmaedeck@gmail.com>
Date: Fri, 13 Jan 2017 15:44:51 -0200
Subject: [PATCH] EXPOSE  CLOSE BUTTON MARGIN PROPERTY FOR TAB ITEM

Create a CloseButtonMargin property and a CloseButtonMarginProperty dependency property into MetroTabItem.cs sou users can change it from outside.
---
 .../Controls/MetroTabItem.cs                  | 19 ++++++++++++++++++-
 .../MahApps.Metro/Themes/MetroTabItem.xaml    |  2 +-
 2 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/src/MahApps.Metro/MahApps.Metro.Shared/Controls/MetroTabItem.cs b/src/MahApps.Metro/MahApps.Metro.Shared/Controls/MetroTabItem.cs
index f4417fd64b..a0928b0379 100644
--- a/src/MahApps.Metro/MahApps.Metro.Shared/Controls/MetroTabItem.cs
+++ b/src/MahApps.Metro/MahApps.Metro.Shared/Controls/MetroTabItem.cs
@@ -59,7 +59,7 @@ private void AdjustCloseButton()
             closeButton = closeButton ?? GetTemplateChild("PART_CloseButton") as Button;
             if (closeButton != null)
             {
-                closeButton.Margin = newButtonMargin;
+                closeButton.Margin = CloseButtonMargin;
             }
         }
 
@@ -128,5 +128,22 @@ public object CloseTabCommandParameter
             get { return GetValue(CloseTabCommandParameterProperty); }
             set { SetValue(CloseTabCommandParameterProperty, value); }
         }
+
+        public static readonly DependencyProperty CloseButtonMarginProperty =
+            DependencyProperty.Register("CloseButtonMargin",
+                                        typeof(Thickness),
+                                        typeof(MetroTabItem),
+                                        new FrameworkPropertyMetadata(new Thickness(0,0,2,0),
+                                                                      FrameworkPropertyMetadataOptions.AffectsArrange | FrameworkPropertyMetadataOptions.AffectsMeasure | FrameworkPropertyMetadataOptions.Inherits,
+                                                                      OnCloseButtonEnabledPropertyChangedCallback));
+
+        /// <summary>
+        /// Gets/sets the Close Button Margin.
+        /// </summary>
+        public Thickness CloseButtonMargin
+        {
+            get { return (Thickness)GetValue(CloseButtonMarginProperty); }
+            set { SetValue(CloseButtonEnabledProperty, value); }
+        }
     }
 }
\ No newline at end of file
diff --git a/src/MahApps.Metro/MahApps.Metro/Themes/MetroTabItem.xaml b/src/MahApps.Metro/MahApps.Metro/Themes/MetroTabItem.xaml
index 64e07b04b8..642d98041e 100644
--- a/src/MahApps.Metro/MahApps.Metro/Themes/MetroTabItem.xaml
+++ b/src/MahApps.Metro/MahApps.Metro/Themes/MetroTabItem.xaml
@@ -43,7 +43,7 @@
                                         CommandParameter="{TemplateBinding CloseTabCommandParameter}"
                                         Width="{TemplateBinding Controls:ControlsHelper.HeaderFontSize, Converter={StaticResource MetroTabItemCloseButtonWidthConverter}}"
                                         Height="{Binding RelativeSource={RelativeSource Self}, Path=Width, Mode=OneWay}"
-                                        Margin="0 0 2 0"
+                                        Margin="{DynamicResource CloseButtonMargin}"
                                         HorizontalAlignment="Right"
                                         VerticalAlignment="Top"
                                         Style="{DynamicResource ChromelessButtonStyle}"