How to Uncheck Rad Combobox Header CheckBox After uncheking any one item template checkbox

[Deekshith]

Hi Iam using RadControls for ASP.NET AJAX Q3 2010.In my application iam having radcombobox with header template and item template checkboxes.I need help to uncheck the header after unchecking any one item template checkboxes.thanks in advance.

[Deekshith]

Bellow is my Code Block:
<telerik:RadComboBox ID="RadComboBox1" Runat="server">

                        <ItemTemplate>

                            <asp:CheckBox ID="CheckBox1" runat="server" Text='<%#DataBinder.Eval(Container.DataItem,"Names")%>'/>

                        </ItemTemplate>

                        <HeaderTemplate>

                            <asp:CheckBox ID="CheckBox2" runat="server" Text="All"/>

                        </HeaderTemplate>

                    </telerik:RadComboBox>