xppanel fail

I've been trying to make a menu using this http://www.codeproject.com/KB/miscctrl/TgXPPanel.aspx (in vb .net 2008 express) it was all going good, but then I added a xpPanel to the form and then deleted it, so I didn't really change anything - but now I have 23 errors saying "XPPanelGroup is ambiguous in the namespace UIComponents" and things similar to that. I'm really new to this kind of stuff so I'd be very grateful for any help!

Please post the code that contains the relevant errors. I suspect that your deletion did not actually 'delete' everything it was supposed to.