Add ClickThrough property to ContainerWidget.

OpenRA.Game/Widgets/Widget.cs

@@ -493,6 +493,8 @@ namespace OpenRA.Widgets
 
 	public class ContainerWidget : Widget
 	{
+		public readonly bool ClickThrough = true;
+
 		public ContainerWidget() { IgnoreMouseOver = true; }
 		public ContainerWidget(ContainerWidget other)
 			: base(other) { IgnoreMouseOver = true; }
@@ -501,6 +503,11 @@ namespace OpenRA.Widgets
 		public override Widget Clone() { return new ContainerWidget(this); }
 		public Func<KeyInput, bool> OnKeyPress = _ => false;
 		public override bool HandleKeyPress(KeyInput e) { return OnKeyPress(e); }
+
+		public override bool HandleMouseInput(MouseInput mi)
+		{
+			return !ClickThrough && EventBounds.Contains(mi.Location);
+		}
 	}
 
 	public class WidgetArgs : Dictionary<string, object>