See the following code. By default, the ImageButton is above the "Region" HeaderText. How can I place the ImageButton under the "Region" HeaderText? Note that I want to keep the sorting features when click the "Region" label.
<telerik:GridTemplateColumn AllowFiltering="false" HeaderStyle-VerticalAlign="Bottom" HeaderStyle-HorizontalAlign="Center" HeaderText="Region" SortExpression="RegionName" UniqueName="RegionName">
<HeaderTemplate>
<div style=" margin:0 10px 0 15px;">
<asp:ImageButton ID="ButtonStartFilter" ImageUrl="../images/placeholder.png" runat="server"/>
</div>
</HeaderTemplate>
</telerik:GridTemplateColumn>