Set up show desktop in compiz

I am looking for a set up in Compiz (?) who could avoid a very little annoying thing. Sometimes if some windows open and want to minimize all with defaut show desktop button, some others (probably were already minimized) show up before, then have to do twice to get to the desktop … wich is kind of strange because that button is there to get quicly to the desktop.
any idea?
Yep, got something… maybe the plank applet to show desktop and the mate applet show desktop are not friends. Using both may cause kind of “conflict”
not sure.