I did try

FOR EACH oControl IN THISFORM.Objects

IF INLIST(UPPER(oControl.baseClass),'TEXTBOX','EDITBOX','COMBOBOX','CHECKBOX')
BINDEVENT(oControl,'InteractiveChange',THISFORM,'mEnableSave')
ENDIF
ENDFOR

This work, but when I try

mFormControls = 'THISFORM.Controls'

FOR EACH oControl IN &mFormControls

IF INLIST(UPPER(oControl.baseClass),'TEXTBOX','EDITBOX','COMBOBOX','CHECKBOX')
BINDEVENT(oControl,'InteractiveChange',THISFORM,'mEnableSave')
ENDIF
ENDFOR


The error message of 'Nesting Error' Prompted.