FormatString to combine 2 Text Fields

[Selva]

Hi,
     I'm using SQLDatasource to bind RADTabstrip Control. Tabs are generated on the fly connecting the DatasourceID to the control. Now I want to have a each tab text with a specific string format. {0} : {1}, TextField1, TextField2. Im trying to achieve this on client side by I'm unable to do so because only one TextField is accepted.. This is where I'm standing now.. Please advise. 

<telerik:RadTabStrip ID="RadTabStrip1" SelectedIndex="0" runat="server" MultiPageID="RadMultiPage1"  EnableEmbeddedSkins="true" Skin="Hay" DataSourceID="sqlDsProducts" DataValueField="ProductVersionID" ScrollChildren="true" ScrollButtonsPosition="Right" Width="800px" OnTabClick="RadTabStrip1_TabClick">
                    <DataBindings>
                        <telerik:RadTabBinding FormatString="  : {0}" TextField="Product_Description"/>
                    </DataBindings>
                </telerik:RadTabStrip>
                <telerik:RadMultiPage runat="server" ID="RadMultiPage1" SelectedIndex="0" OnPageViewCreated="RadMultiPage1_PageViewCreated">
                    <telerik:RadPageView runat="server" ID="RadPageView1" Width="800px">
                           <div>
                           </div>
                </telerik:RadPageView>
             </telerik:RadMultiPage>

Thanks,
Selva