I am using an Item template with an custom attribute Offset. Everything works ok except I am getting a lot of validation warnings on my Offset attribute. Is there a way to avoid them?
| <telerik:RadComboBox runat="server" ID="ddlDayOffset" AllowCustomText="false" NoWrap="true" Width="40ex" | 
| MarkFirstMatch="true" HighlightTemplatedItems="True"> | 
| <ItemTemplate> | 
| <div><span style='font-weight:bolder'><%# DataBinder.Eval(Container, "Attributes['Offset']") %></span> the appointment day</div> | 
| </ItemTemplate> | 
| <Items> | 
| <telerik:RadComboBoxItem Offset="3 weeks before" Value="-21" /> | 
| <telerik:RadComboBoxItem Offset="20 days before" Value="-20" /> | 
| <telerik:RadComboBoxItem Offset="19 days before" Value="-19" /> | 
| <telerik:RadComboBoxItem Offset="18 days before" Value="-18" /> | 
| <telerik:RadComboBoxItem Offset="17 days before" Value="-17" /> |