Fix resizing issue from setting WS_SYSMENU and...
Fix resizing issue from setting WS_SYSMENU and...

and don't show resizing cursor over child controls since it wont work
anyway so no reason to show it.

wangzheng888520/MaterialSkin,Drarig29/MaterialSkin,adamyeager/MaterialSkin,first087/MaterialSkin,IgnaceMaes/MaterialSkin,dexter1515/MaterialSkin,cz-michi/MaterialSkin,salaros/MaterialSkin