Custom Filtering RadGrid and SF

We are using SF 5 and moving all existing website pages .aspx to .ascx for SF.   we have a RadGrid with a custom filtering just like the example on SF .NET filtering. http://demos.telerik.com/aspnet-ajax/grid/examples/programming/filteringtemplatecolumns/defaultvb.aspx?#qsf-demo-source

i added this tag to the top of my ascx

<%@ Register TagPrefix="custom" Namespace="SFLeadingEdgeVB.LEL.FilteringTemplateColumns" %>

when i open my page it crashes on.

Unknown server tag 'custom:FilteringTemplateColumn'.<custom:FilteringTemplateColumn

my class page namespace is:

Namespace SFLeadingEdgeVB.LEL
Public Class FilteringTemplateColumn

any help would be great!

Should "FilteringTemplateColumns"  be part of the namespace?

wrong test page.  yes i removed it in my page but I still get the error.

SFLeadingEdgeVB.LEL

Did you include the "assembly" property?

thanks for the quick reply:

i basically used the exact code sequence from the asp.net demo site:  the custom tag doesn't have assembly:  is that what you mean?

<%@ Register TagPrefix="custom" Namespace="Telerik.GridExamplesCS.Programming.FilteringTemplateColumns" %>
<%@ Register TagPrefix="telerik" Namespace="Telerik.Web.UI" Assembly="Telerik.Web.UI" %>

Try setting Assembly="SFLeadingEdgeVB" and see if that corrects the error
("SFLeadingEdgeVB.dll" is the right file correct?)

I think i got it.  I added the assembly name like you said, but it still failed.  then i added the assembly name with the namespace (SFLeadingEdgeVB.SFLeadingEdgeVB.LEL). i'm atleast in the code now.

thanks again