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POExpander grouping collapses after source reset
 

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    <p>I have a listbox with a bit of templating. Groups are represented by expanders. The listbox is linked to the filesystem and each folder gets its own expander. Any time a file is renamed, deleted, etc, the listbox's view is refreshed. This works great but once the refresh is called, each of the expanders collapses. I can't seem to find a good way to keep them open. I saw another question that used binding to solve this for a single expander. The issue with a data binding on the "IsExpanded" is that there are an unknown number of expanders and I have no way of knowing how many there will be, what they will be called, etc at design time. Any ideas?</p> <pre><code>&lt;ListBox.GroupStyle&gt; &lt;GroupStyle&gt; &lt;GroupStyle.ContainerStyle&gt; &lt;Style TargetType="{x:Type GroupItem}"&gt; &lt;Setter Property="Template"&gt; &lt;Setter.Value&gt; &lt;ControlTemplate TargetType="{x:Type GroupItem}"&gt; &lt;Expander VerticalAlignment="Top" OverridesDefaultStyle="True" Template="{StaticResource SimpleExpanderTemp}"&gt; &lt;Expander.Header&gt; &lt;TextBlock VerticalAlignment="Center" Background="Transparent" Text="{Binding Path=Name}" FontFamily="SegoeUI" FontSize="16" Foreground="Black"/&gt; &lt;/Expander.Header&gt; &lt;Expander.Tag&gt; &lt;LinearGradientBrush StartPoint="0,0" EndPoint="0,1"&gt; &lt;GradientStop Offset="0.0" Color="#696969" /&gt; &lt;GradientStop Offset="1.0" Color="#474747" /&gt; &lt;/LinearGradientBrush&gt; &lt;/Expander.Tag&gt; &lt;ItemsPresenter/&gt; &lt;/Expander&gt; &lt;/ControlTemplate&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;/Style&gt; &lt;/GroupStyle.ContainerStyle&gt; &lt;/GroupStyle&gt; &lt;/ListBox.GroupStyle&gt; </code></pre>
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    1. CORelated question http://stackoverflow.com/q/2808777/620360.
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    2. CO@LPL If you could make that an answer, I'll award you. That link solved my issue completely. I can't believe I couldn't find that solution! thanks
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    3. COThis is not my award. Give that answer an upvote when you've earned the privilege.
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