Why can't I see all the components from GAC in the "Choose Toolbox Items dialog / .NET

I've downloaded a class library's source from the internet and built it in the Visual c# 2005 Express Ed succesfully. Afterthat I've Installed the dll to the Gac

succesfully. I can see it in the directory "C:\WINDOWS\assembly".

But I can't see either my component or some other components being in the GAC in the "Choose Toolbox Items dialog / .NET Framework components tab"

of Visual c# Express 2005?

What conditions the GAC assemblies have to meet to be seen in the "Choose Toolbox Items dialog" ?

My dll may use Framework 1.0...can it be a problem? Ho

[603 byte] By [ultra2] at [2008-1-27]