How to control height/width of legend after -90 degree rotation.

I am working with the OilAndGasExample solution from the customer examples. I want to take all the charts in the vertical chart section and display them horizontally. I am having a problem with the legends, which must be displayed on their side. As an example, I have added a RenderTransform to the resistivity legend, which provides the proper orientation. My problem is that the width and height no longer match the space allotted next to the chart. I assume I have to reverse how the width and height are bound. How do I do that?

<Grid x:Key="ResistivityChartAxisLegend" Style="{StaticResource AxisLegendGridStyle}" RenderTransformOrigin="0.5,0.5">
    <Grid.RenderTransform>
        <RotateTransform Angle="-90"/>
    </Grid.RenderTransform>
    <Grid.RowDefinitions>
        <RowDefinition Height="*"/>
        <RowDefinition Height="Auto"/>
        <RowDefinition Height="20"/>
        <RowDefinition Height="Auto"/>
        <RowDefinition Height="20"/>
    </Grid.RowDefinitions>
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="*"/>
        <ColumnDefinition Width="*"/>
    </Grid.ColumnDefinitions>

    <Line Grid.Row="1" Grid.ColumnSpan="2" Stroke="OrangeRed" X1="0" X2="1" Stretch="Fill" StrokeThickness="1" StrokeDashArray="5,5"/>

    <TextBlock Grid.Row="2" Grid.Column="0" Text="0" HorizontalAlignment="Left" Style="{StaticResource AxisLegendTextBlockStyle}"/>
    <TextBlock Grid.Row="2" Grid.ColumnSpan="2" Text="AVRG 40" HorizontalAlignment="Center" Style="{StaticResource AxisLegendTextBlockStyle}"/>
    <TextBlock Grid.Row="2" Grid.Column="1" Text="1" HorizontalAlignment="Right" Style="{StaticResource AxisLegendTextBlockStyle}"/>

    <Line Grid.Row="3" Grid.ColumnSpan="2" Stroke="DeepSkyBlue" X1="0" X2="1" Stretch="Fill" StrokeThickness="2"/>

    <TextBlock Grid.Row="4" Grid.Column="0" Text="0" HorizontalAlignment="Left" Style="{StaticResource AxisLegendTextBlockStyle}"/>
    <TextBlock Grid.Row="4" Grid.ColumnSpan="2" Text="RESISTIVITY" HorizontalAlignment="Center" Style="{StaticResource AxisLegendTextBlockStyle}"/>
    <TextBlock Grid.Row="4" Grid.Column="1" Text="1" HorizontalAlignment="Right" Style="{StaticResource AxisLegendTextBlockStyle}"/>
</Grid>