I&#39;ve got a WPF window with `SizeToContent=&quot;Height&quot;`. This window contains an `&lt;Expander /&gt;` that displays a list of recent activity. What I&#39;d like is when the expander is expanded the window grows in size proportionally. When hidden the window again resizes proportionally. If the window is resized the expander and it&#39;s contained list view should grow to use the new space. (don&#39;t mind the colors there there to help me figure this out):

**Normal View**

![alt text][1]

**Collapsed**

![alt text][2]

**Resized to new space**

![alt text][3]


So far this works great. The problem comes when the `&lt;Expander /&gt;` is collapsed after the window is resized. Rather than the window collapsing again, the list view is simply hidden:

**Collapsed after Resize**

![alt text][4]

My intuition tells me that the `Height` of the window is being set when the window resizes and thus overrides the `SizeToContent` property. So, how can I get the window to keep it&#39;s size to content behavior after it&#39;s been resized?

Current XAML:

    &lt;Window x:Class=&quot;DeployLX.Licensing.Nlm.Admin.v3.DashboardWindow&quot;
        xmlns=&quot;http://schemas.microsoft.com/winfx/2006/xaml/presentation&quot;
        xmlns:x=&quot;http://schemas.microsoft.com/winfx/2006/xaml&quot;
        Title=&quot;Dashboard&quot; Width=&quot;504&quot; SizeToContent=&quot;Height&quot; Height=&quot;275&quot;&gt;
    
      &lt;DockPanel&gt;
        &lt;Menu DockPanel.Dock=&quot;Top&quot;&gt;
          &lt;MenuItem Header=&quot;_File&quot;&gt;
            &lt;MenuItem Header=&quot;E_xit&quot; Command=&quot;{Binding Path=CloseCmd}&quot; /&gt;
          &lt;/MenuItem&gt;
        &lt;/Menu&gt;
        &lt;Grid DockPanel.Dock=&quot;Top&quot; Margin=&quot;8&quot; ShowGridLines=&quot;True&quot;&gt;
          &lt;Grid.RowDefinitions&gt;
            &lt;RowDefinition /&gt;
            &lt;RowDefinition /&gt;
          &lt;/Grid.RowDefinitions&gt;
          &lt;Grid.ColumnDefinitions&gt;
            &lt;ColumnDefinition /&gt;
            &lt;ColumnDefinition /&gt;
          &lt;/Grid.ColumnDefinitions&gt;
          
          &lt;Grid Grid.RowSpan=&quot;2&quot; Grid.Row=&quot;0&quot; Grid.Column=&quot;0&quot; Margin=&quot;0,0,8,0&quot;&gt;
            &lt;Rectangle Fill=&quot;Red&quot; /&gt;
            &lt;TextBlock&gt;ActiveCount&lt;/TextBlock&gt;        
          &lt;/Grid&gt;
          
          &lt;Grid Grid.Row=&quot;0&quot; Grid.Column=&quot;1&quot; Margin=&quot;0,0,0,4&quot;&gt;
            &lt;Rectangle Fill=&quot;Green&quot; /&gt;
            &lt;TextBlock&gt;Authorization&lt;/TextBlock&gt;
          &lt;/Grid&gt;
          &lt;Grid Grid.Row=&quot;1&quot; Grid.Column=&quot;1&quot; Margin=&quot;0,4,0,0&quot;&gt;
            &lt;Rectangle Fill=&quot;Blue&quot; /&gt;
            &lt;TextBlock&gt;Authorization&lt;/TextBlock&gt;
          &lt;/Grid&gt;      
        &lt;/Grid&gt;
        &lt;Expander Header=&quot;Recent Activity&quot; Margin=&quot;8&quot; IsExpanded=&quot;True&quot;&gt;
          &lt;ListView IsSynchronizedWithCurrentItem=&quot;True&quot; MinHeight=&quot;100&quot;&gt;
            &lt;ListView.View&gt;
              &lt;GridView&gt;
                &lt;GridViewColumn Header=&quot;Status&quot;/&gt;
              &lt;/GridView&gt;
            &lt;/ListView.View&gt;
          &lt;/ListView&gt;
        &lt;/Expander&gt;
      &lt;/DockPanel&gt;
    &lt;/Window&gt;

**UPDATE:** I&#39;ve tried listening to the Collapsed event of the expander and resetting the Windows `SizeToContent` property. This almost works. It will cause it to collapse the window again but when expanded again it goes back to the original 100 pixel height. While it&#39;s feasible to store and capture this info it smells hacky and prone to errors.

  [1]: http://www.deploylx.com/so/wpfexpander/Open.png &quot;Normal view&quot;
  [2]: http://www.deploylx.com/so/wpfexpander/Closed.png &quot;Closed&quot;
  [3]: http://www.deploylx.com/so/wpfexpander/Expanded.png &quot;Expanded to use new space&quot;
  [4]: http://www.deploylx.com/so/wpfexpander/Collapsed.png &quot;Collapsed after Resize&quot;

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Total of 1 Sizetocontent Solutions

How do you keep the WPF window sized to content with an Expander after resize