Improve CoreWindow host window implementation. (Thanks to Yifei Gao.)

Mile.Xaml.Managed/CoreWindowHost.cs

@@ -0,0 +1,38 @@
+/*
+ * PROJECT:   Mouri Internal Library Essentials
+ * FILE:      CoreWindowHost.cs
+ * PURPOSE:   Definition for Mile.Xaml.CoreWindowHost
+ *
+ * LICENSE:   The MIT License
+ *
+ * MAINTAINER: MouriNaruto (Kenji.Mouri@outlook.com)
+ */
+
+using System.Windows.Forms;
+
+namespace Mile.Xaml
+{
+    internal class CoreWindowHost : Form
+    {
+        private const int WS_EX_TRANSPARENT = 0x00000020;
+        private const int WS_EX_LAYERED = 0x00080000;
+
+        public CoreWindowHost()
+        {
+            Controls.Add(new WindowsXamlHost());
+            Show();
+            Hide();
+        }
+
+        protected override CreateParams CreateParams
+        {
+            get
+            {
+                CreateParams CreateParameters = base.CreateParams;
+                CreateParameters.ExStyle = WS_EX_TRANSPARENT | WS_EX_LAYERED;
+                CreateParameters.Style = 0;
+                return CreateParameters;
+            }
+        }
+    }
+}

Mile.Xaml.Managed/XamlApplicationExtensions.cs

@@ -61,10 +61,7 @@ public static void ThreadInitialize(
             // better workaround.
             if (CoreWindowHostWindow == null)
             {
-                CoreWindowHostWindow = new System.Windows.Forms.Form();
-                CoreWindowHostWindow.Controls.Add(new WindowsXamlHost());
-                CoreWindowHostWindow.Show();
-                CoreWindowHostWindow.Hide();
+                CoreWindowHostWindow = new CoreWindowHost();
             }
         }