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Problem Use RadComboBox in RadTreeList

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TreeList
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mehdi
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mehdi asked on 08 Jul 2012, 12:36 PM
Hi
I'M Use RadComboBox in radTreeList In Bellow Code

<telerik:TreeListTemplateColumn DataField="User_ID" UniqueName="User_ID"
                    HeaderText="شناسه کاربر" DataType=System.Int32 HeaderStyle-CssClass="RadGrid" 
                    HeaderStyle-HorizontalAlign=Right ItemStyle-HorizontalAlign=Right>
                      <ItemStyle HorizontalAlign="Right" Width="110px" CssClass=RadGrid />
                      <HeaderStyle HorizontalAlign="Right" Width="110px" CssClass=RadGrid />
                    <ItemTemplate>
                      <asp:Label ID="Label3" runat="server" Text='<%# Eval("User")%>' CssClass=RadGrid Width="100%" />
                    </ItemTemplate>
                    <EditItemTemplate>
                        <telerik:RadComboBox ID="E_cmbUser_ID" runat="server" DataSourceID="SQLDSUser_ID" Width="100px"
                            DataTextField="Name" DataValueField="ID" CssClass=RadGrid />
                    </EditItemTemplate>
                    <InsertItemTemplate>
                        <telerik:RadComboBox ID="I_cmbUser_ID" runat="server" DataSourceID="SQLDSUser_ID" Width="100px"
                            DataTextField="Name" DataValueField="ID" CssClass=RadGrid />
                    </InsertItemTemplate>
                </telerik:TreeListTemplateColumn>


Problem When Insert Or Edit Aoutomatic Insert Button In RadTreeList .
Return Null Value From Sql In RadComboBox

and Not Access To RadComboBox 

Tanx

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