It sounds like the uicontrols you want to hide are not children of the panel (i.e., are not contained in the panel), so they don't get turned off when the panel is made invisible.
You can check which uicontrols are in the panel by using the Object Browser in GUIDE. If your uicontrols are not there, you can put them there by selecting them in GUIDE and dragging them onto the panel, releasing them when the panel outline is highlighted (this will re-parent them, not merely move them).
