Get SelectedItem from TreeView?

Question

Does anyone know how I can get the SelectedItem (not the Header) from a TreeView?
Here is my code:

Answer 1

Step 1 Install the NuGet: Install-Package System.Windows.Interactivity.WPF

Step 2 In your Window tag add: xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"

Step 3 In the TreeView add:

    
         
              
                   
              
          
   ...
   

Step 4 In your ViewModel add:

        private ICommand _selectedItemChangedCommand;
        public ICommand SelectedItemChangedCommand
        {
            get
            {
                if (_selectedItemChangedCommand == null)
                    _selectedItemChangedCommand = new RelayCommand(args => SelectedItemChanged(args));
                return _selectedItemChangedCommand;
            }
        }

        private void SelectedItemChanged(object args)
        {
            //Cast your object
        }