<div dir=ltr align=left>The following is from the dev owner of the toolbox. Does this help?</div> <div dir=ltr align=left> </div> <div dir=ltr align=left>The changes should be saved automatically.  Maybe the tab is being hidden because it contains only disabled items.  If the tab is empty we should show it, but if it contains only disabled items, we hide it.  If the user can see the tab after selecting "Show all" from the context menu, that's what's happening.  The tab should then become enabled when a designer which supports (one or more of) its items is open.</div> <div dir=ltr align=left> </div>