<TextBlock x:Name="OperatorTextBlock" Canvas.Top="15" Canvas.Left="0" Width="40" TextAlignment="Center"
            Foreground="Black" Text="=">
    <TextBlock.ContextMenu>
        <ContextMenu>
            <ContextMenu.Resources>
                <Style TargetType="MenuItem">
                    <Setter Property="HorizontalAlignment" Value="Left" />
                </Style>
            </ContextMenu.Resources>
            <MenuItem Header="Equal" Click="MenuItem_Click" />
            <MenuItem Header="Not equal" Click="MenuItem_Click" />
            <MenuItem Header="Greater than" Click="MenuItem_Click" />
            <MenuItem Header="Greater than or equal" Click="MenuItem_Click" />
            <MenuItem Header="Less than" Click="MenuItem_Click" />
            <MenuItem Header="Less than or equal" Click="MenuItem_Click" />
            <MenuItem Header="Is null" Click="MenuItem_Click" />
            <MenuItem Header="Begins with" Click="MenuItem_Click" />
            <MenuItem Header="Contains" Click="MenuItem_Click" />
        </ContextMenu>
    </TextBlock.ContextMenu>
</TextBlock>