Background color treatment

The main background will be set to White.
A new layer must be created at the lowest level, behind all other layers. This layer's dimensions must match the movie, and its background color may be set according to users's choice.

Steps to create the button

1. Create a transparent button matching the movie's dimensions.
2. Right click the button. Go to properties.
3. Go to Actions
4. Click +
5. Select fsCommand function
6. In the Command window enter click (no arguments!)

The result will be:

on(release) {
    fscommand("click");
}