Event trigger for buttons inside listbox wp7

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C#

Hello All,
This is How my part of mainpage.xml looks

<ListBox x:Name="List"
                    ItemsSource="{Binding ListItemsSource}">
               <ListBox.ItemTemplate>
                   <DataTemplate>
                       <StackPanel>
                               <TextBlock Text="{Binding Name}"  FontSize="30" />
                               <Button Content="Like" x:Name="btnLike" IsEnabled="{Binding Like,Mode=TwoWay}"  >

                                   <i:Interaction.Triggers>
                                       <i:EventTrigger EventName="Click">
                                           <i:InvokeCommandAction Command="{Binding SetLikeButtonCommand}"
                                              CommandParameter="{Binding Path=DataContext, ElementName=btnLike}"/>
                                       </i:EventTrigger>
                                   </i:Interaction.Triggers>

                           </Button>
                       </StackPanel>
                   </DataTemplate>
               </ListBox.ItemTemplate>
               <i:Interaction.Triggers>
                   <i:EventTrigger EventName="SelectionChanged">
                       <i:InvokeCommandAction Command="{Binding SetCountryIdCommand}"
                                              CommandParameter="{Binding Path=SelectedItem, ElementName=List}"/>
                   </i:EventTrigger>
               </i:Interaction.Triggers>
           </ListBox>

My Problem is Event Trigger (Click)for button is not fired.
But in other hand ListBox Event trigger (SelectionChanged) is working fine.

Please help me ,What is the problem with my code ?