How can I use GetModify/SetModify within CRichEditView

[C++ Programming]

I've a SDI Application and want to Enable/Disable some menu items under some specific conditions. My CAppView is derived from CRichEditView and I used the following code to find if it's changed since I set the Modification Flah (using SetModify) or not:

//Some conditions
GetRichEditCtrl().SetModify( FALSE ) ;

//Some other conditions
GetRichEditCtrl().SetModify( TRUE ) ;

/////////////////////////////////////////////////

if ( GetRichEditCtrl().GetModify() )
{
// Do something
}

but GetRichEditCtrl().GetModify() allways returns TRUE, even if I set GetRichEditCtrl().SetModify( TRUE )

Any idea?

Thank you masters!