WPF: ComboBox with reset item

Question

I want to make a ComboBox in WPF that has one null item on the top, when this gets selected, the SelectedItem should be set to null (reset to default state). I\

Answer 1

It is possible to reset the selection if you select an item.

    
        
            
                
                    
                        
                            
                                
                            
                        
                                                   
                
            
        
        First Item
        Second Item
    

Unfortunately this will not work with ItemsSource and a CompositeCollection to add this reset item to an arbitrary list. The reason is WPF can't resolve the Storyboard.TargetName in this scope. But maybe this helps you go on with retemplating the ComboBox.