I needed a very simple extension of the standard combobox so I setup my own UserControl. As comboboxes have a fixes height I wanted to prevent the user from being able to resize vertically.
I remembered from the past that this was a trivial task, but could not remember how it was done. It took me one hour of googling before I found the solution, so I decided to spare everyone else from the trouble and post it here.
To control the selection rules of your control you need to first setup a custom designer:
public class ComboboxControlDesigner : ControlDesigner
public override SelectionRules SelectionRules
return SelectionRules.LeftSizeable |
Use the override to return any selection options you want to support.
Then finally attach the designer to your UserControl using the Designer attribute:
To control resizing during run-time and design-time you can also just try overriding the SetBounds method of the control:
protected override void SetBoundsCore(int x, int y,
int width, int height, BoundsSpecified specified)
base.SetBoundsCore(x, y, 100, 21, specified);
base.SetBoundsCore(x, y, width, height, specified);