Test project to solve the MetroFramework Shadow Glitch
It's solved just adding a 5 pixels padding in the tab control.
Solved in patch https://github.com/rasputino/MetroFrameworkShadowGlitch/commit/28b1a76ac2f9cafb8d15e26dce5ec5c24f69f2bf
Thanks to https://github.com/dennismagno