Binding CustomControl's Property to its inner Context Menu

Hii,

I've my custom Control in which, i'm defining a static contextMenu to its one of the template part control. For e.g. Look at the code below.

<ControlTemplate TargetType="Controls:MyCustomControl"><Border BorderBrush="{TemplateBinding BorderBrush}"><ScrollViewer x:Name="PART_ScrollViewer"
                          Focusable="false"
                          CanContentScroll="True"><ScrollViewer.Template><ControlTemplate TargetType="{x:Type ScrollViewer}"><Grid><Grid.Resources><!--Start: TopRightHeaderTemplate--><ControlTemplate x:Key="TopRightHeaderTemplate" TargetType="ColumnHeader"><Grid Name="RootElement"><Grid.RowDefinitions><RowDefinition/><RowDefinition Height="Auto" /></Grid.RowDefinitions></Grid></ControlTemplate><!--End: TopRightHeaderTemplate--></Grid.Resources><Grid.RowDefinitions><RowDefinition Height="Auto" /><RowDefinition Height="*" /><RowDefinition Height="Auto" /></Grid.RowDefinitions><Button x:Name="PART_SelectAllButton"
                            Command="{x:Static DataGrid.SelectAllCommand}"
                            Focusable="false"
                            ControlHelpers:ControlsHelper.MouseRightButtonDownCommand=""
                            Style="{DynamicResource {ComponentResourceKey ResourceId=SelectAllButtonStyle, TypeInTargetAssembly={x:Type Controls:MyCustomControl}}}"
                            Visibility="{Binding HeadersVisibility,
                                                 ConverterParameter={x:Static DataGridHeadersVisibility.All},
                                                 Converter={x:Static DataGrid.HeadersVisibilityConverter},
                                                 RelativeSource={RelativeSource AncestorType={x:Type Controls:MyCustomControl}}}"
                            Width="{Binding CellsPanelHorizontalOffset,
                                            RelativeSource={RelativeSource AncestorType={x:Type Controls:MyCustomControl}}}" ><Button.ContextMenu><ContextMenu x:Name="cntxMenuSelectAllButton"><MenuItem x:Name="menuItemExportTo"
                                      Header="Export to"
                                      Visibility ={Binding CanUserSearch, RelativeSource={RelativeSource AncestorType={x:Type Controls:MyCustomControl}},
                                                           Converter={StaticResource  boolToVisibilityConvertor}}"><MenuItem x:Name="menuItemExportToExcel" Header="Excel format"
                                        Command="{x:Static Controls:MyCustomControl.ExportToExcelCommand}"></MenuItem></MenuItem></ContextMenu></Button.ContextMenu>

Look at the property i binded with the Context menu's meuItem "CanUserSearch".  I if i set its value to "False", this menu items should not be visible while Running the application. But However, i don't know why i'm not getting the reflection on the context menu Item. (CanUserSearch is depedency property).

Currently i've managed to show/hide that menuItems through code but i know this can be done by direct binding a property.

Its very urgent, anyone can halp please?

Thanks.