i am want to Add a button on GropHeadertempelete .but Add Hyperlinkbutton is not visisible please help my xaml code is:
<telerik:RadGridView Name="GvShutDownMaintance" telerik:StyleManager.Theme="Metro" AutoGenerateColumns="False" HorizontalAlignment="Center" ScrollViewer.VerticalScrollBarVisibility="Auto" Height="530" CanUserDeleteRows="False" CanUserInsertRows="False" FontSize="13" GridLinesVisibility="Both" IsBusy="False" >
<telerik:RadGridView.GroupHeaderTemplate>
<DataTemplate>
<HyperlinkButton Content="sdasjdgajdjaasda" Background="Red"/>
</DataTemplate>
</telerik:RadGridView.GroupHeaderTemplate>
<telerik:RadGridView.Columns>
<telerik:GridViewDataColumn Header="Serial No." DataMemberBinding="{Binding ID}" HeaderTextAlignment="Center" TextAlignment="Center" />
<telerik:GridViewDataColumn Header="Start Date" DataMemberBinding="{Binding StartDate}" HeaderTextAlignment="Center" TextAlignment="Center"/>
<telerik:GridViewDataColumn Header="End Date" DataMemberBinding="{Binding EndDate}" HeaderTextAlignment="Center" TextAlignment="Center"/>
<telerik:GridViewDataColumn Header="Duration" DataMemberBinding="{Binding SDuration}" HeaderTextAlignment="Center" TextAlignment="Center"/>
<telerik:GridViewDataColumn Header="Remarks" DataMemberBinding="{Binding Remarks}" HeaderTextAlignment="Center" TextAlignment="Center"/>
<telerik:GridViewDataColumn Header="Type" DataMemberBinding="{Binding UserType}" HeaderTextAlignment="Left" TextAlignment="Left" Width="50*"/>
<telerik:GridViewDataColumn Header="Delete">
<telerik:GridViewDataColumn.CellTemplate>
<DataTemplate>
<telerik:RadButton Name="btnShutdownMaintance" Click="btnShutdownMaintance_Click" Background="{x:Null}">
<telerik:RadButton.Content>
<Image Source="/CCCSUI;component/Images/Delete_icon.jpg" Width="40" Height="20"/>
</telerik:RadButton.Content>
</telerik:RadButton>
</DataTemplate>
</telerik:GridViewDataColumn.CellTemplate>
</telerik:GridViewDataColumn>
</telerik:RadGridView.Columns>
</telerik:RadGridView>
the Hyper Link not visible