adime_d_button_proc man page
int adime_d_button_proc(int msg, DIALOG *d, int c)
Similar to Allegro´s `d_button_proc()´, but with 3d-ish style. It also has a slightly different behaviour: Unlike `d_button_proc()´, the D_EXIT flag has no effect. Instead you need to set the `d1´ field to one of the three constants:
The button behaves like a check box, i.e. when clicked it toggles between being in and being out.
The button exits the dialog when clicked.
If you provide a callback function in the dp2 field, then it will be called whenever the button is clicked. This callback should have the form `int my_callback(DIALOG *d)´, and its return value will be passed back to the dialog manager.