RadGridViews header CheckBox contant binding error

[Govind]

Hi,

 I have used RadGridViews(Telerik.Windows.Controls.GridView) in WPF that has some column. The header of column is a CheckBox. Some times header CheckBox content binding is works fine, but when i changed to another form and return back to the same form CheckBox content binding doesn't work ie, its not showing the CheckBox contant.

the code is below
   <telerikGrid:RadGridView >
 <telerikGrid:RadGridView.Columns>                                
                            <telerikGrid:GridViewDataColumn  DataMemberBinding="{Binding Name}" >
                                <telerikGrid:GridViewBoundColumnBase.Header  >
                                    <CheckBox IsChecked="False"  Content="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type telerikGrid:RadGridView}}, Path=DataContext.HeaderName}" />
                                </telerikGrid:GridViewBoundColumnBase.Header>
                            </telerikGrid:GridViewDataColumn>
</telerikGrid:RadGridView >

its shows some time like this

any solution pls send me, very urgent..

Thanks in advance
Govind