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

In the properties bar, set "RenderMode" to "System" or use

.RenderMode = System.Windows.Forms.ToolStripRenderMode.System;

Doing this will change the .BackColor to "Control" but you can change that after if you want.