audio_form object
This method will return the ID of the control that contains the cancel button.
int get_cancel_button()
Parameters:
None.
Return value:
The ID of the control on success, or -1 on failure or if no control has the cancel button.
Remarks:
For a more detailed explanation on how the primary and cancel attributes work, please see the topic covering the create_button method.
Example:

    // Make a simple form with a few buttons.

    #include "form.bgt"

    audio_form form;

    void main()
    {
    form.create_window("Example Form", true);
    int set_device=form.create_button("Set &Device");
    int reset=form.create_button("Reset &Password");
    int website=form.create_button("Open &Website");
    int ok=form.create_button("OK", true, false);
    int cancel=form.create_button("E&xit", false, true);
    int assist_me=form.create_button("&Help");
    while(true)
    {
    form.monitor();
    wait(5);
    if(form.is_pressed(ok))
    {
    alert("Information", "The cancel button is "+form.get_cancel_button());
    exit();
    }
    if(form.is_pressed(cancel))
    {
    exit();
    }
    if(form.is_pressed(assist_me))
    {
    alert("Help", "This program does pretty much nothing. It is supposed to be an example from the BGT manual.");
    exit();
    }
    if((key_down(KEY_LMENU))&&(key_pressed(KEY_F4)))
    {
    exit();
    }
    }
    }