Concave cornered Rectangle - Expression Blend Tip


An expression blend tip to create a Path looks like a concave cornered rectangle.  Put a Grid with 5*5 rows and columns. and add 4 ellipse and a rectangle as in the following XAML.

<Grid x:Name="grid" >
    <Grid.ColumnDefinitions>
     <ColumnDefinition Width="0.1*"/>
     <ColumnDefinition Width="0.1*"/>
     <ColumnDefinition Width="0.6*"/>
     <ColumnDefinition Width="0.1*"/>
     <ColumnDefinition Width="0.1*"/>
    </Grid.ColumnDefinitions>
    <Grid.RowDefinitions>
     <RowDefinition Height="0.1*"/>
     <RowDefinition Height="0.1*"/>
     <RowDefinition Height="0.6*"/>
     <RowDefinition Height="0.1*"/>
     <RowDefinition Height="0.1*"/>
    </Grid.RowDefinitions>
    <Rectangle Fill="#FF000000" Grid.Column="1" Grid.Row="1" Grid.RowSpan="3" Grid.ColumnSpan="3" StrokeThickness="0"/>
    <Ellipse Fill="#FFEA0000" VerticalAlignment="Stretch" StrokeThickness="0" Grid.Row="0" Grid.Column="0" Grid.RowSpan="2" Grid.ColumnSpan="2"/>
    <Ellipse Fill="#FFEA0000" StrokeThickness="0" VerticalAlignment="Stretch" Grid.ColumnSpan="2" Grid.RowSpan="2" Grid.Row="3"/>
    <Ellipse Fill="#FFEA0000" StrokeThickness="0" VerticalAlignment="Stretch" Grid.ColumnSpan="2" Grid.Row="3" Grid.RowSpan="2" Grid.Column="3"/>
    <Ellipse Fill="#FFEA0000" StrokeThickness="0" VerticalAlignment="Stretch" Grid.Column="3" Grid.ColumnSpan="2" Grid.Row="0" Grid.RowSpan="2"/>
   </Grid>

Do the Subtract Path operation by selecting menu option Object -> Combine -> Subtract
Now you will get a Path object as bellow XAML.

<Path Fill="#FFA1A1A1" Stretch="Fill" Stroke="#FF000000" StrokeThickness="1" 
Width="50" Height="50" Data="M17.200002,0L120.4,0 120.4,2.3066998E-06C120.4,6.7378696,128.10079,12.200001,137.60001,12.200001L137.60001,85.400003C128.10077,85.400003,120.4,90.862138,120.4,97.6L17.200002,97.6C17.200002,90.862151,9.4993697,85.400003,0,85.400003L0,12.199999C9.4993663,12.200015,17.200002,6.7378725,17.200002,0z"/>

The above can be achieved in many different ways. You can use Expression Design or Adobe illustrator to generate a Path like this.
And if you are looking for a custom shape like this, you can create that by deriving a class from System.Windows.Shapes.Shape by doing some similar Geometry operations. Then we can define some dependency Properties for controlling the Concave radius too.

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