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    <p>You can use the Expression Blend SDK for invoking commands in response to events in general, however my experience has been that not all events are supported by EventTrigger.</p> <p>For example, this seems to work:</p> <pre><code>&lt;Label Content="LabelText"&gt; &lt;i:Interaction.Triggers&gt; &lt;i:EventTrigger EventName="MouseMove"&gt; &lt;i:InvokeCommandAction Command="{Binding IsVisibleChangedCommand, Mode=OneWay}"/&gt; &lt;/i:EventTrigger&gt; &lt;/i:Interaction.Triggers&gt; &lt;/Label&gt; </code></pre> <p>But this doesn't:</p> <pre><code>&lt;Label Content="LabelText"&gt; &lt;i:Interaction.Triggers&gt; &lt;i:EventTrigger EventName="IsVisibleChanged"&gt; &lt;i:InvokeCommandAction Command="{Binding IsVisibleChangedCommand, Mode=OneWay}"/&gt; &lt;/i:EventTrigger&gt; &lt;/i:Interaction.Triggers&gt; &lt;/Label&gt; </code></pre> <p>I'm not sure why, but Blend SDK does not seem to like the IsVisible property. You can do something similar but using Visibility (instead of IsVisible) with a PropertyChangedTrigger like this:</p> <pre><code>&lt;Label x:Name="label1" Content="LabelText"&gt; &lt;i:Interaction.Triggers&gt; &lt;ei:PropertyChangedTrigger Binding="{Binding Visibility, ElementName=label1}"&gt; &lt;i:InvokeCommandAction Command="{Binding IsVisibleChangedCommand, Mode=OneWay}"/&gt; &lt;/ei:PropertyChangedTrigger&gt; &lt;/i:Interaction.Triggers&gt; &lt;/Label&gt; </code></pre> <p>BTW - Here are the namespaces:</p> <pre><code>xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity" xmlns:ei="http://schemas.microsoft.com/expression/2010/interactions" </code></pre> <p>Also, here is another solution to your specific problem that does not require the Blend SDK:</p> <p>Instead of directly binding an event to a command, you can bind the Visibility property of your object to a viewmodel property and execute the command from the property setter like this:</p> <p>View:</p> <pre><code>&lt;UserControl x:Class="SampleApp.Views.EventBindingDemoView" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Height="200" Width="200"&gt; &lt;UserControl.Resources&gt; &lt;BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter" /&gt; &lt;/UserControl.Resources&gt; &lt;Grid&gt; &lt;Label Content="LabelText" Visibility="{Binding Path=ElementIsVisible, Mode=TwoWay, Converter={StaticResource BooleanToVisibilityConverter}}"/&gt; &lt;!-- The rest of your view here --&gt; &lt;/Grid&gt; &lt;/UserControl&gt; </code></pre> <p>ViewModel (ViewModelBase should implement INotifyPropertyChanged and OnPropertyChanged(string propertyName) ):</p> <pre><code>public class EventBindingDemoViewModel : ViewModelBase { private bool ElementIsVisibleField = true; // or false if it should initially be hidden public bool ElementIsVisible { get { return this.ElementIsVisibleField; } set { if (this.ElementIsVisibleField != value) { this.ElementIsVisibleField = value; this.OnPropertyChanged("ElementIsVisible"); // Execute command this.IsVisibleChangedCommand.Execute(null); } } } public ICommand IsVisibleChangedCommand; // The rest of your viewmodel here } </code></pre> <p>Either way should work.</p>
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    1. COMystery solved! IsVisibleChanged is a CLR event, not a routed event. The Blend SDK EventTrigger only works with routed events.
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    2. COFrom the summary tag on DataEventTrigger it says "Trigger which fires when a **CLR event is raised** on an object. Can be used to trigger from events on the data context, as opposed to a standard EventTrigger which uses routed events on FrameworkElements." Maybe I will post a message on their disscussion board about it.
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    3. CONote that IsVisible and Visibility are not necessarily the same thing: "Determination of the IsVisible value takes all factors of layout into account. In contrast, Visibility, which is a settable property, only indicates the intention to programmatically make an element visible or invisible."
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