thanks for the hints, but I still don't get it
maybe I missed something, but there is no actionURL or canvas type parameter to create an iframe in the main content frame (just new window, dialogs , ..) :-/ as I said, I'm really bad at coding, is it possible that someone "code" an example zimlet like the "TAB Iframe" but this time with a panel menu item?
<menuItem label="Test menu 1.0" id="TEST_MENU_SOME_ID1">
<canvas type="window" width="300" height="300" />
<actionUrl method="get" target="http://www.yahoo.com" />
thanks and sorry for my ignorance :-)