WPF FAQ - Menu

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Separator controls inside Menu elements appear differently from Separator controls outside a Menu. When you create a Menu with a Separator, the control automatically applies the Style identified by the SeparatorStyleKey property. Styles are placed in resource dictionaries and are searched for by their keys. To change the Style of a Separator inside a Menu, you must use the SeparatorStyleKey property to create your new Style.

The following example demonstrates this.

[XAML]

<Style x:Key='{x:Static MenuItem.SeparatorStyleKey}' TargetType='Separator'>
  <Setter Property='OverridesDefaultStyle' Value='true' />
  <Setter Property='Template'>
    <Setter.Value>
      <ControlTemplate TargetType='{x:Type Separator}'>
        <Border Width='30' Height='4' Margin='4' Background='Red'/>
      </ControlTemplate>
    </Setter.Value>
  </Setter>
</Style>

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