PDL::Graphics::TriD::ButtonControl - default event handler subroutines
Bless an oject into the class ButtonControl, expects the associated Window object to be supplied as an argument.
The ButtonControl class is a base class which all TriD event controllers should inherit from. By itself it does not do much. It defines ButtonPressed and ButtonRelease functions which are expected by the Event loop.
Activates the viewport the mouse is inside when pressed
Define the width and Height of the window for button control