NumericUpDown backcolor not working as expected

Question

I recently had the need to write a version of the Windows NumericUpDown control which could highlight whether a value was mandatory. It needed to do this by changing the back co

Answer 1

Windows does not properly/completely repaint the NumericUpDown control when it is disabled.

See this post: NumericUpDown background colour change for disabled element

Enabling / disabling the control after it is displayed is a work-around.