GROUPBOX #handle.ext, "label", x, y, wide, high

This command adds a groupbox to a window or dialog box.  Other controls added to the owning window which overlap the displayed area of the groupbox will be nested inside the groupbox.  This is particularly useful for radiobuttons.  It is possible for only one radiobutton in a radio-set to be "set" at one time.  The groupbox allows the window to have multiple radio-sets of radiobuttons.  Only one of all radiobuttons in a groupbox will be allowed to be in a set state.  Click on one to set it, and all the others will be reset.

print #handle.ext, "a string"
This changes the text displayed on the control.  This command sets the contents (the visible label) to be "a string".  The handle must be of form #handle.ext that includes a unique extension so that commands can be printed to the control.

print #handle.ext, "!font facename pointSize" - sets the font.

print #handle.ext, "!enable"
This causes the control to be enabled.

print #handle.ext, "!disable"
This causes the control to be inactive and grayed-out.