How to remove this strange visual artifact in the corner of ToolStrip Winforms control?

Question

Here is the picture that shows the problem. Take a look at the bottom right corner.

Anyone knows how to get rid of it?

Setting LayoutStyle to

Answer 1

I think your best shot would be to set the RenderMode to System in the properties and leave the layout properties to HorizontalStackWithOverflow. But that is if you don't mind changing the tooltip paint style.