Teleric Grid view add edit

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ASP.NET4

hi,

I have used teleric grid view to add,edit and delete the record.It is working fine but now i one field with dropdown box.I want add dropdown box at the time of insert the record,but its its give me the error if i have added asp.net dropdown box. following is the code..

<telerik:RadInputManager runat="server" ID="RadInputManager1" Enabled="true">
            <telerik:TextBoxSetting BehaviorID="TextBoxSetting1" InitializeOnClient="false" ErrorMessage="* Requied Field">
            </telerik:TextBoxSetting>
            <telerik:TextBoxSetting BehaviorID="TextBoxSetting2">
            </telerik:TextBoxSetting>
            <telerik:NumericTextBoxSetting BehaviorID="NumericTextBoxSetting2" Type="Number"
                AllowRounding="true" DecimalDigits="0" MinValue="0">
            </telerik:NumericTextBoxSetting>
            <telerik:TextBoxSetting BehaviorID="TextBoxSetting3" InitializeOnClient="false" ErrorMessage="* Requied Field">
            </telerik:TextBoxSetting>
        </telerik:RadInputManager>

how can i add the dropdown box control in it??