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<TextBox x:Name="TextBoxInvoker" Height="33" HorizontalAlignment="Left" VerticalAlignment="Top" Width="123" Text="TextBox" TextWrapping="Wrap">
<interaction:Interaction.Triggers>
<interaction:EventTrigger EventName="KeyDown" >
<behavior:TextBoxEnterButtonInvoke TargetName="TargetedButton" />
</interaction:EventTrigger>
</interaction:Interaction.Triggers>
</TextBox>
var triggerCollection = System.Windows.Interactivity.Interaction.GetTriggers(TextBoxInvoker);
var triggers = this.TextBoxInvoker.Triggers;