Listbox content shouldn't steal clicks if they're clipped

OpenRA.Game/Widgets/ListBoxWidget.cs

@@ -84,6 +84,11 @@ namespace OpenRA.Widgets
 
 		public override int2 ChildOrigin { get { return RenderOrigin + new int2(0, (int)ListOffset); } }
 
+		public override Rectangle GetEventBounds()
+		{
+			return EventBounds;
+		}
+		
 		public override void Tick (World world)
 		{
 			if (UpPressed && ListOffset <= 0) ListOffset += ScrollVelocity;

OpenRA.Game/Widgets/Widget.cs

@@ -149,7 +149,7 @@ namespace OpenRA.Widgets
 		}
 		
 		public virtual Rectangle EventBounds { get { return RenderBounds; } }
-		public Rectangle GetEventBounds()
+		public virtual Rectangle GetEventBounds()
 		{
 			return Children
 				.Where(c => c.IsVisible())