Hi, I've tried something in Mac OSX but doesn't luck Main stack "A", substack "B" and "C" from stack "A", a btn with sheet stack "B" in stack "A" from stack "B", a btn with sheet stack "C" in stack "B" the last command doesn't work : the stack "C" is open but without the "sheet" effect... Bien amicalement. Yves COPPE yvescoppe at skynet.be