<Grid x:Class="ScratchControl.BooleanExpressionHolder"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             mc:Ignorable="d" 
             d:DesignHeight="300" d:DesignWidth="300">
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="auto"/>
        <ColumnDefinition Width="*"/>
        <ColumnDefinition Width="auto"/>
    </Grid.ColumnDefinitions>
    <Polygon Name="LeftPart"
                     VerticalAlignment="Stretch" Stretch="Fill" Points="0, 4, 4, 0, 4, 8" 
                    Fill="White" Stroke="White"
                     SnapsToDevicePixels="True" Width="7"/>
    <Grid Name="CenterPart" Grid.Column="1" MinWidth="20"  Margin="0"
                SnapsToDevicePixels="True"
                Background="White">
    </Grid>
    <Polygon Name="RightPart" 
                     VerticalAlignment="Stretch" Stretch="Fill" Grid.Column="2"
                 Fill="White" Stroke="White"
                     Points="0, 0, 0, 8, 4, 4" SnapsToDevicePixels="True" Width="7"/>
</Grid>
