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MenuItem Trigger does not work

I want to use triggerto automatically hide MenuItemwhich is disabled. If I use my style inside a certain MenuItemone like this, it works -

<MenuItem
    Command="{Binding RelativeSource={RelativeSource FindAncestor, 
                        AncestorType={x:Type ContextMenu}}, 
                        Path=PlacementTarget.DataContext.ExportCommand}"
    Header="Export...">
    <MenuItem.Style>
        <Style TargetType="{x:Type MenuItem}">
            <Style.Triggers>
                <Trigger Property="IsEnabled" Value="False">
                    <Setter Property="Visibility" Value="Collapsed" />
                </Trigger>
            </Style.Triggers>
        </Style>
    </MenuItem.Style>
</MenuItem>

but if I put the same one stylein ResourceDictionarylike this, then it won’t work -

<Style x:Key="{x:Type MenuItem}" TargetType="{x:Type MenuItem}" >
    <Style.Triggers>
        <Trigger Property="IsEnabled" Value="False">
            <Setter Property="Visibility" Value="Collapsed" />
        </Trigger>
    </Style.Triggers>
</Style>

I want to have this behavior for all of my menu items, and I do not want to put this style on everyone MenuIteminside mine ContextMenu. Any idea why it doesn't work?

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2 answers

. :

<Grid>
<Grid.Resources>
  <Style x:Key="{x:Type MenuItem}" TargetType="MenuItem" >
    <Setter Property="OverridesDefaultStyle" Value="False" />
    <Setter Property="TextBlock.Foreground" Value="Blue" />
    <Style.Triggers>
      <Trigger Property="IsEnabled" Value="False">
        <Setter Property="Visibility" Value="Collapsed" />
      </Trigger>
    </Style.Triggers>
  </Style>

</Grid.Resources>

<TextBox Text="Hello!" IsReadOnly="True">
  <TextBox.ContextMenu>
    <ContextMenu >
      <MenuItem Header="Item1" />
      <MenuItem Header="Item2" IsEnabled="False"/>
      <MenuItem Header="Item3" />
    </ContextMenu>
  </TextBox.ContextMenu>
</TextBox>
</Grid>
+1

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