.net - Adding my own WPF TriggerAction -

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I am trying to add a custom trigger action to our code. The following XAML snippet is: 

  style x: key = "ToolBarButtonStyle" TargetType = "button" & gt; & Lt; Style.Triggers & gt; & Lt; Event Trigger Routing Avent = "PreviewMouseDown" & gt; & Lt; Action: MyAction / & gt; & Lt; / EventTrigger & gt; & Lt; /Style.Triggers> ...   
 MyAction is defined as follows:  
  Public class MyAction: trigger action & lt; DependencyObject & gt; Call {safe override zero} (object parameter) {// something}}   
 However, when I run the code, I get the following exception:  
 
 1) The given object should be an example of trigger action or derivative type.  
 The result: 'Add an exception' add value to the collection of 'System Windy Trigger Action Coalition'. Line number '29' and line position '15'.   
 I am running Visual Studio 2010, targeting .Net 4.0. any suggestion?   
 
 
 Adding any triggering action under the style of 'Event Trigger' expects action.  
  System.Windows.TriggerAction   
 Your custom action uses 'My work'  
  System.Windows.Interactivity TriggerAction & LT; T & gt; (Normal type)   
 And so you can try the following error. It seems that this is working in your case.  
  & lt; Button content = "custom action" width = "150" height = "50" & gt; & Lt; Conversation: Interaction.Triggers & gt; & Lt; Conversation: EventTrigger EventName = "PreviewMouseDown" & gt; & Lt; Action: MyAction & gt; & Lt; / Action: MyAction & gt; & Lt; / Engagement: EventTrigger & gt; & Lt; / Engagement: Interaction.Triggers & gt; & Lt; / Button & gt;   
 Here the alias has been added for interactivity. Let me know if you need more information

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