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WPF cannot capture custom event using Microsoft.Xaml.Behaviors.Wpf (solved)

Suppose i have a project that raise an event. When i click on a button, obviously "Click" event will be raised. Inside the click handler method, i raised a custom event called "FileOpen" event.

I have successfully captured "Click" event by testing whether MessageBox popped or not. However, it fails to capture "FileOpen" custom event, it doesn't pop another MessageBox that tells "FileOpen event captured".

I'm guessing its because i put the wrong name (maybe wrong format, e.g must be fully qualified name or so) in the XAML of line <i:EventTrigger EventName="FileOpen">. So how do i capture this custom event?

XAML for the button:
 <Button x:Name="MyButton" Content="Click to fire FileOpen event">
    <i:Interaction.Triggers>
        <i:EventTrigger EventName="Click">
            <i:InvokeCommandAction Command="{Binding ClickCommand}"/>
        </i:EventTrigger>

        <i:EventTrigger EventName="FileOpen">
            <i:InvokeCommandAction Command="{Binding FileOpenCommand}"/>
        </i:EventTrigger>
    </i:Interaction.Triggers>
</Button>
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