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POAttached behaviour on parent mvvm doesn't work
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  1. POAttached behaviour on parent mvvm doesn't work
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    copied!<p>I have 2 Usercontrols, parent and child, child control has button witch I want to click with parent viewmodel method, but it doesn't work, please tell me what I miss in parent view, I have something like this:</p> <pre><code>XAML ... &lt;view:childUC vm:ChildBehaviuor.AddCommand="{Binding ExampleCommand}"/&gt; </code></pre> <p>Behavior code:</p> <pre><code> public static readonly DependencyProperty AddCommandProperty =DependencyProperty.RegisterAttached ( "AddCommand", typeof(ICommand), typeof(childBehavior), new PropertyMetadata(OnAddCommand) ); public static ICommand GetAddCommand(DependencyObject obj) { return (ICommand)obj.GetValue(AddCommandProperty); } public static void SetAddCommand(DependencyObject obj, ICommand value) { obj.SetValue(AddCommandProperty,value); } private static ICommand command; private static void OnAddCommand(DependencyObject sender, DependencyPropertyChangedEventArgs e) { child gp = sender as child; childBehavior.command = (ICommand)sender.GetValue(childBehavior.AddCommandProperty); if(gp != null &amp;&amp; command != null) { if ((e.NewValue != null) &amp;&amp; (e.OldValue == null)) { gp.AddButton.Click += ButtonClick; } else if ((e.NewValue == null) &amp;&amp; (e.OldValue != null)) { gp.AddButton.Click -= ButtonClick; } } } public static void ButtonClick(object sender,RoutedEventArgs eventArgs) { childBehavior.command.Execute(null); } </code></pre> <p>VM parent command:</p> <pre><code> public ICommand ExampleCommand { get { if (this.exampleCommand == null) { this.exampleCommand = new DelegateCommand(...); } return this.exampleCommand ; } } </code></pre>
 

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