Well it can be done!
 
Create a form variable such as;
vDirty = (RBTI_DIRTY_FLAG)
 
Create a Custom_Form_Action with these commands;
RECALC VARIABLES
IF vDirty = 1 THEN
  PROPERTY Button ENABLED 'TRUE'
 ELSE
  PROPERTY Button ENABLED 'FALSE'
ENDIF
RETURN
 
Call the Custom_Form_Action from any control using
PROPERTY RBASE_FORM_ACTION <ActionName> ''
 
May not be as elegant as I wanted but hey it works.
 
Jan

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