MenuItem shortcut in ControlTemplate - wpf

Question

I've got next makrup:
<Style TargetType="{x:Type MenuItem}">
<Setter Property="MinWidth" Value="65" />
<Setter Property="MinHeight" Value="30" />
<Setter Property="IsTabStop" Value="False" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type MenuItem}">
<Border x:Name="MainBorder" BorderThickness="1" Background="Black">
<TextBlock Margin="5" Text="{TemplateBinding Header}" Foreground="{TemplateBinding Foreground}" />
<Popup x:Name="SubMenuPopup" IsOpen="{Binding Path=IsSubmenuOpen, RelativeSource={RelativeSource TemplatedParent}}" Placement="Right"
AllowsTransparency="True" Focusable="False">
<Border Background="Gray">
<Grid x:Name="SubMenu" Grid.IsSharedSizeScope="True" Background="Transparent">
<StackPanel Margin="0" IsItemsHost="True" KeyboardNavigation.DirectionalNavigation="Cycle" Background="Gray" />
</Grid>
</Border>
</Popup>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
When I create MenuItem somewhere and set it's Header property with "_" symbol - it doesn't create shortcut for this menu item.
Example - letter 'F' is not underlined and shortcut doesn't work.
How to support shortcuts in ControlTemplates in MenuItems?
Thanks.

Answer 1

It is not the complete template but instead of the TextBlock put a ContentPresenter that can recognize access keys:
<ContentPresenter Margin="5" Content="{TemplateBinding Header}" TextBlock.Foreground="{TemplateBinding Foreground}" RecognizesAccessKey="True" />
I suppose the xaml you have pasted here is only part of your implementation, so my solution is onl y a continuation of yours with the access key working...
You can find entire templates just like this one: http://msdn.microsoft.com/en-us/library/ms747082%28v=vs.85%29.aspx

Answer 2

If you want you menu item letter to underline itself of keypress then you have to set the InputGesture on menuitem like this:
<MenuItem Header="_File"
InputGestureText="Ctrl+F"
Commmand={Binding NewFileCommand}/>
But if you want to create shortcut for the menuitem command then you will have to create the commandbindings like below on your window:
<Window.CommandBindings>
<CommandBinding Command="local:MyCommands.NewFile" Executed="NewFile_Executed" />
</Window.CommandBindings>
<Window.InputBindings>
<KeyBinding Key="F" Modifiers="Control" Command="local:MyCommands.NewFile"/>
</Window.InputBindings>