Support custom styles for LayoutGridResizerControl

source/Components/AvalonDock/Controls/LayoutGridControl.cs

@@ -290,7 +290,21 @@ private void CreateSplitters()
 		{
 			for (var iChild = 1; iChild < Children.Count; iChild++)
 			{
-				Children.Insert(iChild, new LayoutGridResizerControl { Cursor = this.Orientation == Orientation.Horizontal ? Cursors.SizeWE : Cursors.SizeNS });
+				var splitter = new LayoutGridResizerControl();
+
+				if (Orientation == Orientation.Horizontal)
+				{
+					splitter.Cursor = Cursors.SizeWE;
+					splitter.Style = _model.Root?.Manager?.GridSplitterVerticalStyle;
+				}
+				else
+				{
+					splitter.Cursor = Cursors.SizeNS;
+					splitter.Style = _model.Root?.Manager?.GridSplitterHorizontalStyle;
+				}
+
+
+				Children.Insert(iChild, splitter);
 				// TODO: MK Is this a bug????
 				iChild++;
 			}

source/Components/AvalonDock/DockingManager.cs

@@ -1104,6 +1104,59 @@ public double GridSplitterHeight
 
 		#endregion GridSplitterHeight
 
+		#region GridSplitterVerticalStyle
+
+		/// <summary>
+		/// GridSplitterVerticalStyle Dependency Property
+		/// </summary>
+		public static readonly DependencyProperty GridSplitterVerticalStyleProperty = DependencyProperty.Register("GridSplitterVerticalStyle", typeof(Style), typeof(DockingManager),
+				new FrameworkPropertyMetadata((Style)null));
+
+		/// <summary>
+		/// Gets or sets the GridSplitterVerticalStyle property.  This dependency property 
+		/// indicates the style to apply to the LayoutGridResizerControl when displayed vertically.
+		/// </summary>
+		public Style GridSplitterVerticalStyle
+		{
+			get
+			{
+				return (Style)GetValue(GridSplitterVerticalStyleProperty);
+			}
+			set
+			{
+				SetValue(GridSplitterVerticalStyleProperty, value);
+			}
+		}
+
+		#endregion
+
+		#region GridSplitterHorizontalStyle
+
+		/// <summary>
+		/// GridSplitterHorizontalStyle Dependency Property
+		/// </summary>
+		public static readonly DependencyProperty GridSplitterHorizontalStyleProperty = DependencyProperty.Register("GridSplitterHorizontalStyle", typeof(Style), typeof(DockingManager),
+				new FrameworkPropertyMetadata((Style)null));
+
+		/// <summary>
+		/// Gets or sets the GridSplitterHorizontalStyle property.  This dependency property 
+		/// indicates the style to apply to the LayoutGridResizerControl when displayed horizontally.
+		/// </summary>
+		public Style GridSplitterHorizontalStyle
+		{
+			get
+			{
+				return (Style)GetValue(GridSplitterHorizontalStyleProperty);
+			}
+			set
+			{
+				SetValue(GridSplitterHorizontalStyleProperty, value);
+			}
+		}
+
+		#endregion
+
+
 		#region DocumentPaneMenuItemHeaderTemplate
 
 		/// <summary><see cref="DocumentPaneMenuItemHeaderTemplate"/> dependency property.</summary>