Quote from FrmDrawForm in Palm OS Reference manual.
If the saveBehind form attribute is set and the form is visible, this function saves the bits behind the form using the bitsBehindForm field in the FormType structure. You should call this function in response to a frmOpenEvent. If you do any custom drawing, you should do so after you call this function not before. If you do custom drawing, respond to frmUpdateEvent as well as frmOpenEvent, and be sure to return true to specify that the frmUpdateEvent was handled. The default event handler for frmUpdateEvent calls FrmDrawForm, so if you allow the event to fall through by returning false, your custom drawing is erased. -- For information on using the Palm Developer Forums, or to unsubscribe, please see http://www.palmos.com/dev/support/forums/
