ContextMenu Set Null , how to do it in XAML?

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WPF

I want to not to show the defualt menu of TextBox which placed in DataGrid.

in code I can do that like that

TextBox.ContextMenu =Null;

but my TextBox which placed in DataGrid Cell is Tamplate,. xaml code like that;

<DataGridTemplateColumn  >
          <DataGridTemplateColumn.CellTemplate >
               <DataTemplate>
                   <StackPanel>
                         <TextBox>  
                                             TextWrapping="Wrap"
                                             IsReadOnly="False"
                                             ContextMenu="{x:Null}"
                         </TextBox>
                     </StackPanel>
                 </DataTemplate>
             </DataGridTemplateColumn.CellTemplate>
         </DataGridTemplateColumn>

I tried this code, but it does't work .


so, how can I set Textbox's ContextMenu to Null in Xaml?
also, I want to know how can I add my ContextMenu to TextBox in this case with code behind as well as in xaml?

could anyone tell me ? tell me relative article and info?

thanks in advance!