Grid Splitter and MinWidth

I am trying to set a MinWidth for my columns.

MinWidth works correctly for Column 0 but not Column 2. The splitter just keeps dragging and I can get the Column to be less than the declared MinWidth The MinWidth seems to only take effect if the Column Width has a numeric value rather than Auto.... Is there a way to get that to work with Auto or just * ??

Any ideas?

    <!-- Content Area -->
    <Grid x:Name="ContentGrid"
          Grid.Row="2">
        <Grid.ColumnDefinitions>
            <ColumnDefinition MinWidth="32" Width="260"/>
            <ColumnDefinition Width="8" />
            <ColumnDefinition MinWidth="100" Width="*" />
        </Grid.ColumnDefinitions>

        <!-- Navigation  -->
        <ItemsControl Name="NavigationRegion" 
                  Regions:RegionManager.RegionName="NavigationRegion"
                  Grid.Column="0">
            <ItemsControl.ItemsPanel>
                <ItemsPanelTemplate>
                    <Grid/>
                </ItemsPanelTemplate>
            </ItemsControl.ItemsPanel>
        </ItemsControl>
        <!-- Splitter -->
        <controls:GridSplitter x:Name="GridSplitter" 
                               Grid.Column="1" 
                               VerticalAlignment="Stretch" 
                               HorizontalAlignment="Center" 
                               Background="{StaticResource SplitterBackgroundColor}" 
                               Width="8" 
                               UseLayoutRounding="True" 
                               BorderThickness="1"     
                               BorderBrush="Black"  
                               Height="Auto"/>
        <!-- Form -->
        <ItemsControl x:Name="MainRegion"
                      Grid.Column="2" 
                      Regions:RegionManager.RegionName="MainRegion">
            <ItemsControl.ItemsPanel>
                <ItemsPanelTemplate>
                    <Grid/>
                </ItemsPanelTemplate>
            </ItemsControl.ItemsPanel>
        </ItemsControl>


    </Grid>

Answers

The way I fixed this is to set a MaxWidth for Column 0. When SizeChanged fires I get the MaxWidth value for Column 0 based upon the current ActualWidth

So I removed my MinWidth from Column 2 as well. Here's the modifications:

<!-- Content Area -->
<Grid x:Name="ContentGrid"
      Grid.Row="2">
    <Grid.ColumnDefinitions>
        <ColumnDefinition MinWidth="32" Width="260"/>
        <ColumnDefinition Width="8" />
        <ColumnDefinition Width="*" />
    </Grid.ColumnDefinitions>

...

Then the Event setting MaxWidth

this.SizeChanged += (s, e) =>
{
    double maxWidth = this.ActualWidth / 2.0;
    this.ContentGrid.ColumnDefinitions[0].MaxWidth = maxWidth;
}

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