i wnat to make it common for multiple listboxs on my wpf window
<i:Interaction.Triggers>
<i:EventTrigger EventName="SelectionChanged">
<i:InvokeCommandAction Command="{Binding MyCommand}" CommandParameter="{Binding ElementName=employeeListBox, Path=SelectedValue}"/>
</i:EventTrigger>
</i:Interaction.Triggers>