Inherited TreeView control in Sharepoint 2010

Question

I need to inherit the asp.net Treeview for fixing a rendering issue. I am currently trying to accomplish that in an Sharepoint project that also contains various other things like webparts, aspx, images, etc.

I tried to do it like this the first time:

namespace MyNamespace.Controls
{
    [ToolboxData("<{0}:TreeViewAdv runat=server>")]
    public class TreeViewAdv : TreeView
    {
        public override void RenderBeginTag(HtmlTextWriter writer)
        {
            base.RenderBeginTag(writer);
            if (base.DesignMode)
            {
                writer.RenderBeginTag(HtmlTextWriterTag.Tr);
                writer.RenderBeginTag(HtmlTextWriterTag.Td);
            }
        }
    }
}

When I now try to use that control in an aspx inside that assembly, I am not able to reference the control with a statement like this:

"<%@ Register TagPrefix="custom" Namespace="MyNamespace.Controls" %>"

The question is: Is this supposed to work? Do I really have to create a second assembly for that only hosting server controls (hope not)?

Every hint is highly appreciated.

Thanks

Holger

Answer 1

The Register tag most likely needs to have an assembly attribute.

Unless you add the assembly hint to the <pages> element in web.config

You may also need a <SafeControl> element

Is your library getting installed into the GAC?

Answer 2

I beleive you need to your class assemblies via the package designer, like below

After that you can reference your assemblies in your solution like below

Hope this helps.