Control that is bigger than the form region is getting clipped in C#

Question

Hi,

I have a normal Form control and in the CTOR function I have the following :

this.Region = System.Drawing.Region.FromHrgn(WinUser.CreateRoundRectRgn(0, 0, this.Width, this.Height, 16, 16));

Later in my App I create a ListBox object and show it at the bottom of my parent form, but the listbox size is bigger than my form and therefore the bottom half of the ListBox which is outside the Parent Form region gets clipped.

Is there any way around this, that is I do not want the form size to be increased instead I want the Listbox to show completely even if it is bigger than the form.

anand

Answer 1

This kind of feat can only be accomplished if you create a window that's allowed to extend past the boundaries of the form. Windows supports this, the dropdown list of a combo box would be an example. Windows Forms however doesn't care much for it. Check my code in this thread to see how it's done.