Error when using two related radcombox box in formview

[Doan]

Hi All, I 'm a matter when using RadGrid and radwindow to
insert/update data from database. I used Formview to add data( controls:
textbox, combobox), but i used two related combox in formview to filter
data , i have  error:
Databinding methods such as Eval(), XPath(), and Bind() can only be used in the context of a databound control.
My codes:
1. combox 1:
<telerik:RadComboBox ID="ddlMaSP" Runat="server" DataSourceID="SqlDsMaSP"

DataTextField="TenSP" DataValueField="MaSP" SelectedValue='<%# Bind("MaSP") %>'

Skin="Office2007" Width ="300px">

</telerik:RadComboBox>

<asp:SqlDataSource ID="SqlDsMaSP" runat="server"

ConnectionString="<%$ ConnectionStrings:PGKH %>" SelectCommand="PGKH_CboMaSP"

SelectCommandType="StoredProcedure">

</asp:SqlDataSource>

2. combbox thứ 2:

<telerik:RadComboBox ID="ddlCTMaSP" Runat="server" DataSourceID="SqlDsCTMaSP"

DataTextField="CTMaSP" DataValueField="IdCTMaSP"

SelectedValue='<%# Bind("IdCTMaSP") %>' Skin="Office2007" Width ="300px">

</telerik:RadComboBox>

<asp:SqlDataSource ID="SqlDsCTMaSP" runat="server"

ConnectionString="<%$ ConnectionStrings:PGKH %>"

SelectCommand="PGKH_CboChiTietMaSP" SelectCommandType="StoredProcedure">

<SelectParameters>

<asp:ControlParameter ControlID="ddlMaSP" Name="MaSP"

PropertyName="SelectedValue" Type="Int32" />

</SelectParameters>

</asp:SqlDataSource>
I get error When i using Autopostback for two comboxbox, but i not
use Autopostback is not error but two comboxbox not related. Thanks all.

[Nencho]

Hello Doan,

Could you provide us with your entire implementation, in order to try to replicate the problem locally? In addition, please demonstrate the approach that you use to make the RadComboBoxes related.

Regards,
Nencho
Telerik