Hanndling mouse event in WPF application MVVM

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WPF

MVVM

event

I am using System.Windows.Interactivity.dll and Microsoft.Expression.Interaction.dll to do event handling in Viewmodel in my MVVM WPF project. below is the code inside my Xaml:

<ItemsControl ItemsSource="{Binding Path= HeaderList}" Grid.Row="0" Grid.Column="0" >
       <ItemsControl.ItemTemplate>
           <DataTemplate>
                 <TextBlock   Text="{Binding Text}" Width="100" HorizontalAlignment="Left" >
                     <i:Interaction.Triggers>
                         <i:EventTrigger EventName="PreviewMouseLeftButtonDown">
                            <ie:CallMethodAction MethodName="PrevMouseDownEventHandler" TargetObject="{Binding}" />
                         </i:EventTrigger>
                      </i:Interaction.Triggers>
               </TextBlock>
           </DataTemplate>
       </ItemsControl.ItemTemplate>
   </ItemsControl>

for this I added namespaces in the same Xaml.

xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
xmlns:ie="http://schemas.microsoft.com/expression/2010/interactions"

and in my viewmodel I have created a method having PrevMouseDownEventHandler name which is same as that of I mentioned as CallMethod inside EventTigger in the Xaml.

On running my application when I presses mouse button on TextBlock event is generated and look for PrevMouseDownEventHandler method and leave me into following exception:

Could not find method named 'PrevMouseDownEventHandler' on object of type 'string' that matches the expected signature.

this method is as below in my ViewModel.

public void PrevMouseMoveEventHandler(object sender, MouseButtonEventArgs e)
    {
        // Some implementation here;  
    }

I don't have any idea where I am going wrong. Except this all the funtionalities inside Viewmodel is working fine for me. what would be possible solution for this?