Comparison of ig bound Templated Checkbox to boolean BoundDataField

Shows up as text "true" or "false":
        <ig:BoundDataField DataFieldName="IsCostSaving" Key="IsCostSaving" width="30px">
            <Header Text="Cost Saving" />
          </ig:BoundDataField>    

Shows up as a checkbox with checked value picked up from bound field:
         <ig:TemplateDataField Key="cb1" width="30px">
            <Header Text="Cost Saving" />
               <ItemTemplate>
                 <asp:CheckBox ID="cb1" runat="server"  Checked='<%# Eval("IsCostSaving") %>' Enabled="false"  />
                </ItemTemplate>
          </ig:TemplateDataField>