MouseOver Trigger firing on ContextMenu with overridden ControlTemplate. Where is it coming from?

Question

I have this very simple ControlTemplate:

<ControlTemplate TargetType="{x:Type ContextMenu}">
                    <Border 
                           Name="Border"
                           Background="{StaticResource BlueBackground}"
                           BorderBrush="LightBlue"
                           CornerRadius="10"
                           BorderThickness="1" >
                        <StackPanel IsItemsHost="True"/>
                    </Border>
                </ControlTemplate>

I made it to create a nifty jawdroppingly beautiful rounded corner! However, when I point the mouse over a contextmenu a MouseOver Trigger fires from somewhere that draws a terribly ugly nearly square border on top of my nifty rounded border!

Where is it coming from??

EDIT: The most likely cause is that the ContextMenu is an ItemsControl that holds MenuItems, even when my ContextMenu holds a single UserControl. So the UserControl is seen as a MenuItem and highlighted when the IsMouseOver==true! What is the easiest way to disable this behaviour?

Have you got anything interesting in that StackPanel? What about adding some padding to the Border element, to see if it makes a difference. — Jay

Kep Amun Kep Amun · Accepted Answer · 2010-03-08T14:31:50

You can set the ItemContainerStyle property of your ContextMenu to a custom style for MenuItems.

<ContextMenu.ItemContainerStyle>
    <Style
        TargetType="MenuItem">
        <Setter
            Property="Template">
            <Setter.Value>
                <ControlTemplate
                    TargetType="MenuItem">
                    <TextBlock
                        Text="{TemplateBinding Header}" />
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</ContextMenu.ItemContainerStyle>

With this strategy you have to make your own triggers for any mouse over effects you want, but Click and Checked events will still fire normally.

MouseOver Trigger firing on ContextMenu with overridden ControlTemplate. Where is it coming from?

1 Answers