Thank you very much!

In fact, it develops from Borislav Borissov's suggestion, to get it done. Thank you! Cetin, this time I understand completely you're doing, but I tried to paste the custom method in the form, then evoke the method... the controls were not removed, may be it is about the name formation...

however, I developed from your idea as follows:

LPARAMETERS class_name

x = thisform.Controlcount
FOR n = 1 TO thisform.Controlcount
    IF UPPER(thisform.Controls(x).Class) == UPPER(class_name)
       thisform.RemoveObject(thisform.Controls(x).Name)
    ENDIF
    x = x - 1
ENDFOR

Although it is not the quickest to do it, it works fine. My goal is to find a command like, Thisform.SetAll('delete','nEditBox') whereas 'delete' is action & 'nEditBox' is the class of controls belonged to...

Thanks very much