RADIOBUTTONENABLE name state

Enables or disables the radio button identified by name. If state equals TRUE, then the radio button is enabled. If state equals FALSE, then the radio button is disabled.

WINDOWCREATE "main "mywindow "mytitle 0 0 100 100 []
GROUPBOXCREATE "mywindow "mygroupbox 10 10 80 60
RADIOBUTTONCREATE "mywindow "mygroupbox "myradiobutton [Switch Me] 20 20 60 20
RADIOBUTTONENABLE "myradiobutton "False

The radio button is now disabled

RADIOBUTTONENABLE "myradiobutton "True
WINDOWDELETE "mywindow