Question

How can I extend a Button?

I want a Button that has an additional property IsSwitchOffable.

Do I have to write an extra custom control?

EDIT:
I want that the button is usable as a standard WindowsFormsButton.

This includes that I can add the button at design time!

Answer 1

Extending a button control is no different then extending any class in C#. Simply do the following:

class ToggleButton : Button {
// Add your extra code
}