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    copied!<p>Is this what you want? Notice the GridSplitter property ResizeBehavior.</p> <pre><code>&lt;Grid &gt; &lt;Grid.ColumnDefinitions&gt; &lt;ColumnDefinition Width="5*"/&gt; &lt;ColumnDefinition Width="auto"/&gt; &lt;ColumnDefinition Width="2*"/&gt; &lt;/Grid.ColumnDefinitions&gt; &lt;TreeView&gt; &lt;TreeViewItem Header="1"&gt; &lt;TreeViewItem Header="2"&gt; &lt;TreeViewItem Header="3"/&gt; &lt;/TreeViewItem&gt; &lt;TreeViewItem Header="3"&gt; &lt;TreeViewItem Header="4"/&gt; &lt;/TreeViewItem&gt; &lt;TreeViewItem Header="5"/&gt; &lt;TreeViewItem Header="6"/&gt; &lt;/TreeViewItem&gt; &lt;/TreeView&gt; &lt;GridSplitter Grid.Column="1" Width="10" ResizeDirection="Columns" ResizeBehavior="PreviousAndNext"/&gt; &lt;Canvas Grid.Column="2" Background="LightGray"/&gt; &lt;/Grid&gt; </code></pre> <p>Edit: Here is a working example, showing both approaches. If this is not what you want, then please say so.</p> <pre><code>&lt;Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d" x:Class="WpfApplication1.MainWindow" Title="MainWindow" d:DesignWidth="516" d:DesignHeight="310"&gt; &lt;Grid&gt; &lt;Grid.ColumnDefinitions&gt; &lt;ColumnDefinition Width="*"/&gt; &lt;ColumnDefinition Width="*"/&gt; &lt;/Grid.ColumnDefinitions&gt; &lt;Grid.RowDefinitions&gt; &lt;RowDefinition Height="auto"/&gt; &lt;RowDefinition Height="*"/&gt; &lt;/Grid.RowDefinitions&gt; &lt;Label Content="Change size of content"/&gt; &lt;Border BorderBrush="Black" BorderThickness="1" Grid.Row="1" Margin="10"&gt; &lt;Expander Header="Expander" &gt; &lt;Grid &gt; &lt;Grid.ColumnDefinitions&gt; &lt;ColumnDefinition Width="5*"/&gt; &lt;ColumnDefinition Width="auto"/&gt; &lt;ColumnDefinition Width="2*"/&gt; &lt;/Grid.ColumnDefinitions&gt; &lt;TreeView&gt; &lt;TreeViewItem Header="1"&gt; &lt;TreeViewItem Header="2"&gt; &lt;TreeViewItem Header="3"/&gt; &lt;/TreeViewItem&gt; &lt;TreeViewItem Header="3"&gt; &lt;TreeViewItem Header="4"/&gt; &lt;/TreeViewItem&gt; &lt;TreeViewItem Header="5"/&gt; &lt;TreeViewItem Header="6"/&gt; &lt;/TreeViewItem&gt; &lt;/TreeView&gt; &lt;GridSplitter Grid.Column="1" Width="10" ResizeDirection="Columns" ResizeBehavior="PreviousAndNext"/&gt; &lt;Canvas Grid.Column="2" Background="LightGray"/&gt; &lt;/Grid&gt; &lt;/Expander&gt; &lt;/Border&gt; &lt;Label Content="Change size of expander" Grid.Column="1"/&gt; &lt;Border BorderBrush="Black" BorderThickness="1" Grid.Row="1" Grid.Column="1" Margin="10"&gt; &lt;Grid &gt; &lt;Grid.ColumnDefinitions&gt; &lt;ColumnDefinition Width="5*"/&gt; &lt;ColumnDefinition Width="auto"/&gt; &lt;ColumnDefinition Width="2*"/&gt; &lt;/Grid.ColumnDefinitions&gt; &lt;Expander&gt; &lt;TreeView&gt; &lt;TreeViewItem Header="1"&gt; &lt;TreeViewItem Header="2"&gt; &lt;TreeViewItem Header="3"/&gt; &lt;/TreeViewItem&gt; &lt;TreeViewItem Header="3"&gt; &lt;TreeViewItem Header="4"/&gt; &lt;/TreeViewItem&gt; &lt;TreeViewItem Header="5"/&gt; &lt;TreeViewItem Header="6"/&gt; &lt;/TreeViewItem&gt; &lt;/TreeView&gt; &lt;/Expander&gt; &lt;GridSplitter Grid.Column="1" Width="10" ResizeDirection="Columns" ResizeBehavior="PreviousAndNext"/&gt; &lt;Canvas Grid.Column="2" Background="LightGray"/&gt; &lt;/Grid&gt; &lt;/Border&gt; &lt;/Grid&gt; &lt;/Window&gt; </code></pre>
 

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