How do I make a checkbox gui control?

[bx83]

I've tricked taking button_onclick(), and changing the button graphic (from an empty box to a checked box and visa-versa), however it says '.Graphic is read only'.
What do I do? I can't change the button image, so I'm screwed it would appear.

[Crimson Wizard]

From the manual:

readonly int Button.Graphic;

Gets the current image on a GUI button. If a value less than 1 is returned, then no image is currently displayed on the button.

This property is read-only; in order to set the image, you must use one of the NormalGraphic, MouseOverGraphic or PushedGraphic properties.

[bx83]

But will normalgraphic etc. change the image permenantly? Or will it just appears cheked at the moment I push it, and then unchecked?

[Crimson Wizard]

Yes, it sets it permanently, same for other properties.

[Khris]

int Button.NormalGraphic;

Gets/sets the button's normal sprite (ie. the graphic used when the button is not pushed and the mouse is not over it).