StoredProcedure as SqlDataSource Problem

[Marcus]

If I take StoredProcedure as SqlDataSource for Combobox "RadCombobox2", I can not select a value(see Att.1). If I configure sqldatasource3(see Att.2) when I put manuelly the field entry, I get errors:

The DataSourceID of 'cbDays' must be the ID of a control of type IDataSource.  A control with ID 'SqlDataSource3' could not be found.

If I take instead of StoredProcedure  a Select.. define - no problem.

       <div class="class_1" style="width:512px">
           <telerik:RadGrid ID="RadGrid1" runat="server" CellSpacing="0"
               DataSourceID="SqlDataSource1" GridLines="None">
<MasterTableView AutoGenerateColumns="False" DataKeyNames="DokId"
                   DataSourceID="SqlDataSource1">
<CommandItemSettings ExportToPdfText="Export to PDF"></CommandItemSettings>

<RowIndicatorColumn FilterControlAltText="Filter RowIndicator column">
<HeaderStyle Width="20px"></HeaderStyle>
</RowIndicatorColumn>

<ExpandCollapseColumn FilterControlAltText="Filter ExpandColumn column">
<HeaderStyle Width="20px"></HeaderStyle>
</ExpandCollapseColumn>

    <Columns>
        <telerik:GridTemplateColumn DataField="DokuType"
            FilterControlAltText="Filter column column" HeaderText="Materials"
            UniqueName="DokuType">
            <EditItemTemplate>
                <telerik:RadComboBox runat="server">
                </telerik:RadComboBox>
            </EditItemTemplate>
            <ItemTemplate>
                <telerik:RadComboBox ID="RadComboBox1" Runat="server">
                    <Items>
                        <telerik:RadComboBoxItem runat="server" Text="Documentation"
                            Value="Tagungsunterlagen" />
                        <telerik:RadComboBoxItem runat="server" Text="Books" Value="Bücher" />
                        <telerik:RadComboBoxItem runat="server" Text="Other" Value="Sonstiges" />
                    </Items>
                </telerik:RadComboBox>
            </ItemTemplate>
        </telerik:GridTemplateColumn>
        <telerik:GridTemplateColumn DataField="VAday"
            FilterControlAltText="Filter column1 column" HeaderText="Days"
            UniqueName="VAday">
            <EditItemTemplate>
                <telerik:RadComboBox runat="server">
                </telerik:RadComboBox>
            </EditItemTemplate>
            <ItemTemplate>
                <telerik:RadComboBox ID="RadComboBox2" Runat="server"
                    DataSourceID="SqlDataSource3" SelectedValue='<%# Bind("VAday") %>'>
                </telerik:RadComboBox>
            </ItemTemplate>
        </telerik:GridTemplateColumn>
        <telerik:GridTemplateColumn FilterControlAltText="Filter Delegates column"
            HeaderText="Delegates" UniqueName="Delegates">
        </telerik:GridTemplateColumn>
        <telerik:GridTemplateColumn DataField="Menge" DataType="System.Int16"
            FilterControlAltText="Filter Menge column" HeaderText="Additional Amount"
            UniqueName="Menge">
        </telerik:GridTemplateColumn>
        <telerik:GridTemplateColumn DataField="Price"
            FilterControlAltText="Filter DokuType column" HeaderText="Unit Price"
            UniqueName="Price">
            <EditItemTemplate>
                <asp:TextBox ID="DokuTypeTextBox" runat="server" Text='<%# Bind("DokuType") %>'></asp:TextBox>
            </EditItemTemplate>
            <ItemTemplate>
                <asp:Label ID="DokuTypeLabel" runat="server" Text='<%# Eval("DokuType") %>'></asp:Label>
            </ItemTemplate>
        </telerik:GridTemplateColumn>
    </Columns>

<EditFormSettings>
<EditColumn FilterControlAltText="Filter EditCommandColumn column"></EditColumn>
</EditFormSettings>
</MasterTableView>

<FilterMenu EnableImageSprites="False"></FilterMenu>

<HeaderContextMenu CssClass="GridContextMenu GridContextMenu_Default"></HeaderContextMenu>
           </telerik:RadGrid>
           <asp:SqlDataSource ID="SqlDataSource1" runat="server"
               ConnectionString="<%$ ConnectionStrings:webzeus %>"
               SelectCommand="SELECT * FROM [Dokus] WHERE ([Number] = @Number)">
               <SelectParameters>
                   <asp:SessionParameter  Name="Number" SessionField="curNumber"
                       Type="Int32" />
               </SelectParameters>
           </asp:SqlDataSource>
           <asp:SqlDataSource ID="SqlDataSource3" runat="server"
               ConnectionString="<%$ ConnectionStrings:webzeus %>"
               SelectCommand="pr_TNproTag" SelectCommandType="StoredProcedure">
               <SelectParameters>
                   <asp:SessionParameter DefaultValue="12814" Name="curNumber"
                       SessionField="curNumber" Type="Int32" />
                   <asp:Parameter DefaultValue="Dokus" Name="curPar" Type="String" />
               </SelectParameters>
           </asp:SqlDataSource>
       </div>

</div>

[Cat Cheshire]

It seems that a control called "cbDays" raises the exception.
However there is no such combo in your markup...
Maybe this combo is defined somewhere in your code-behind?