DataBinding to a WPF grid's cell

The idea was to use the data binding capabilities of WPF to ensure that a given element placed inside a grid's cell stays square (i.e. width = height). The problem is that it is not possible to directly access the height of a given row... Thus the trick is to place a border (zero thickness = not visible) inside that row and bind the element that should stay square to it.

For example like that:

<Grid >

        <Grid.RowDefinitions>

            <RowDefinition Height="100*"/>

            <RowDefinition Height="10*" />

            <RowDefinition Height="30*" />

        Grid.RowDefinitions>

        <Grid Grid.Row="0" >

            <Grid.ColumnDefinitions>

                <ColumnDefinition Width="100*" />

                <ColumnDefinition Width="10*" />

            Grid.ColumnDefinitions>

            <Border Grid.Column="0" Grid.Row="0" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" x:Name="MyBorder" />

            <WindowsFormsHost Grid.Column="0" Grid.Row="0" Width="{Binding ElementName=MyBorder, Path=ActualHeight}" Name="host" VerticalAlignment="Stretch" Loaded="host_Loaded"/>

            <my:ColorScaleViewer Grid.Column="1" Grid.Row="0" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" x:Name="colorScaleViewer1"/>

        Grid>

Grid>