Is it allowed with MVVM to run a RoutedEventArgs event in the xaml.cs?

Question

For example, if I want to implement a GridViewColumnHeader MenuItem.Click, can I do so in the xaml.cs?

   <GridViewColumn DisplayMemberBinding=
    "{Binding Path=LastName}" 
    Width="100">
    <GridViewColumnHeader>Last Name
        <GridViewColumnHeader.ContextMenu>
        <ContextMenu  MenuItem.Click="LastNameCM_Click"  
                      Name="LastNameCM">
            <MenuItem Header="Ascending" />
            <MenuItem Header="Descending" />
        </ContextMenu>
        </GridViewColumnHeader.ContextMenu>
     </GridViewColumnHeader>
   </GridViewColumn>

Ok I do it now this way, Thanks for help:

      AscendingUserIdClicked = new RelayCommand(OrderByUserId);
      DescendingUserIdClicked=new RelayCommand(OrderByDescendingUserId);

     private void OrderByUserId(object parameter)
     {
        AscUserIdIsChecked = true;
        DescUserIdIsChecked = false;
        Users = new ObservableCollection<User>(Users.OrderBy(x => x.UserId));
     }
     private void OrderByDescendingUserId(object parameter)
     {
        AscUserIdIsChecked = false;
        DescUserIdIsChecked = true;
        Users = new ObservableCollection<User>(Users.OrderByDescending(x => x.UserId));
     }

And at Xaml:

     <GridViewColumn DisplayMemberBinding="{Binding UserId}"  Width="50">
                    <GridViewColumnHeader>UserId
                        <GridViewColumnHeader.ContextMenu>
                            <ContextMenu>
                                <MenuItem Header="Ascending" Command="{Binding AscendingUserIdClicked}" IsChecked="{Binding AscUserIdIsChecked}"/>
                                <MenuItem Header="Descending" Command="{Binding DescendingUserIdClicked}" IsChecked="{Binding DescUserIdIsChecked}"/>
                            </ContextMenu>
                        </GridViewColumnHeader.ContextMenu>
                    </GridViewColumnHeader>
                </GridViewColumn>