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

The above method did not work out for me. My workaround was:

    private void smartRefresh()
    {
        if (oldBackColor != BackColor) {
            oldBackColor = BackColor;
            Hide();
            Application.DoEvents();
            Show();
            Application.DoEvents();
        }
    }

With a private member oldBackColor.

Now it always shows correctly but does not flicker.

Addendum: I think some part of the Control doesn't get painted at all (I consider it a bug) as the "mispainted" bos around it is not uniformly colored an somtimes traces of the window that was there before can be seen.