WhileRightMouseDown()
This function must be called after a ONBUTTONRIGHTCLICK event occurred. If you call this function, Hollywood will wait until the user has finished his mouse button click. It is absolutely necessary to call this function right after the ONBUTTONRIGHTCLICK event occurred because even if the user clicks the mouse only once, several events may be generated. To prevent this, call this function right after the ONBUTTONRIGHTCLICK occurred.