Q. Window class, onEraseBackground/1, de- fines (Solved)
1. is executed when a visible window is being created
2. is executed when a window is being closed, it is possible to prevent the win- dow from closing
3. when the background of a window must be erased this event is executed
4. when a window must be re-painted this event is executed
- c. when the background of a window must be erased this event is executed