Hi Johnny,

In order to filter a non-editable column, you can use this snippet :

 function WebGrid1_OnRowSelect(controlId, tblName, rowIndex, rowEl) {           

            var WebGrid1 = ISGetObject(controlId);
            if (WebGrid1.GetSelectedObject().GetRowObject().Type == "FilterRow") {
                WebGrid1.GetSelectedObject().ToRowObject().GetCells().GetNamedItem("CustomerID").SetForceNoEdit(false);                
            }
            else {
                WebGrid1.GetSelectedObject().ToRowObject().GetCells().GetNamedItem("CustomerID").SetForceNoEdit(true);
            }
            return true;
        }

with AllowEdit is set to true.

Hope this help.

Regards,

Julia