[RESOLVED] WPF DockPanel

I'm very new to WPF programming, but I thought I would see if I could gain some functionality buy converting one of my old Win Forms. Right of the go I have a question. I have to treeview controls inside a dockpanel. I would like each to take up half the panel. I tried using Width="50%" like I would with a web app, but that didn't work. I could set them in the code behind, but it seems like there should be a way to specify the width of the treeview is half that of the parent dock panel in XAML.

This is what I ended up using.

Code:

---

    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*"/>
            <ColumnDefinition Width="*"/>
        </Grid.ColumnDefinitions>
            <TreeView Name="TreeView1" Grid.Row="0" Grid.Column="0"  />
            <TreeView Name="TreeView2" Grid.Row="0" Grid.Column="1" />
    </Grid>

---

Big thanks to this post: http://www.vbforums.com/archive/index.php/t-650070.html