protected override void OnPaint(
	PaintEventArgs painteventargs
)

Protected Overrides Sub OnPaint ( _
	painteventargs As PaintEventArgs _
)

protected:
virtual void OnPaint(
	PaintEventArgs^ painteventargs
) override

We pass the delegate a copy of the Graphics object to protect the rest of the Paint code from irrevocable changes (for example, Graphics.translate).

If you override this in a subclass you should not make permanent changes to the passed in Graphics. For example, you should not alter the clip Rectangle or modify the transform. If you need to do these operations you may find it easier to create a new Graphics from the passed in Graphics and manipulate it.

Further, if you do not invoker super's implementation you must honor the opaque property, that is if this component is opaque, you must completely fill in the background in a non-opaque color. If you do not honor the opaque property you will likely see visual artifacts.