Trying to add a user control to the toolbox

I am trying to add a user control to the toolbox so I can import that on a selected page and I am getting the following error when I try to insert it into a page.

I get this in the toolbox

#ResourceNotFound#Market Grid (Market Grid is the name of the control


Then when I try to drop it on the page I get


Specified argument was invalid and out of range

Parameter name: name

Any ideas?


We are evaluating the product to see if it will do what we want and I know it should be able to handle this, I just need to get it working before we make a decision.

The name parameter is the 'programmatic' name, and normally the ClassName of the control.