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POCan't bind to IsExpanded on Expander
 

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  1. POCan't bind to IsExpanded on Expander
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    <p>Blacklight is an older set of WPF controls and styles. The code can be found <a href="http://blacklight.codeplex.com" rel="nofollow">here</a>. It contains a control called AnimatedExpander which isn't really an expander, rather it just implements HeaderedContentControl and adds an IsExpandedProperty dprop:</p> <pre><code> public static readonly DependencyProperty IsExpandedProperty = DependencyProperty.Register("IsExpanded", typeof(bool), typeof(AnimatedExpander), new PropertyMetadata(true)); public bool IsExpanded { get { if (this.expandToggleButton != null) { return this.expandToggleButton.IsChecked.Value; } return (bool)GetValue(IsExpandedProperty); } set { SetValue(IsExpandedProperty, value); } } </code></pre> <p>I need to bind to IsExpanded so that I can persist whether expanders are expanded. I'm pretty sure I have the binding setup correctly, and that there is a problem with this custom dependency property. If I open the view in Snoop, and set the IsExpanded=True on the expander, the binding works. However, just clicking the expandToggleButton on the control only expands the control, it doesn't hit my binding.</p> <pre><code> &lt;controls:AnimatedExpander IsExpanded="{Binding SGGExpanderExpanded}" /&gt; private bool _sGGExpanderExpanded; public bool SGGExpanderExpanded { get { return _sGGExpanderExpanded; } set { if (_sGGExpanderExpanded != value) { _sGGExpanderExpanded = value; OnPropertyChanged("SGGExpanderExpanded"); } } } </code></pre> <p>How can I bind to a value that changes when the user clicks the toggle button that is wired to expand the control?</p>
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    1. USJoeB
    1. USJoeB
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    1. COpost the full code and XAML of that control.
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      1. USFederico Berasategui
    2. COThanks for the interest. The code is available at the link, and can be tested by simply binding one of the example AnimatedExpanders to a dummy viewmodel. As I have the bad solution I mentioned working, I can't afford to waste a bunch of time looking for a good solution right now. I'll try to come back on the weekend to find a pure MVVM solution.
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      1. USJoeB
    3. COright. I'm almost sure that the problem you're having is due to a bad implementation in that control.
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      1. POCan't bind to IsExpanded on Expander
      1. USFederico Berasategui
 

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