Multiple Expander have to collapse if ONE is expanded

Question

Having 4 Expander controls. When one expander is expanded how can I make all others collapse/close?

Answer 1

I also needed this, but all answers was too much work IMO. Here is how I did it:

1. added StackPanel (child align is set to vertical).
2. added 3 Expanders into it. (needed 3)
3. set height of Expanders to 120px to add elements to it.
4. each Expander called ex1..3.

5. each one got 2 events

   private void ex1_Collapsed(object sender, RoutedEventArgs e)  
   {  
       ex1.Height = 23.0;  
   }  
   
   private void ex1_Expanded(object sender, RoutedEventArgs e)    
   {  
       ex1.Height = 120.0;  
       ex2.IsExpanded = false;  
       ex3.IsExpanded = false;  
   }  
   

6. reset all the Expanders that should be collapsed height back to 23px at window_loaded.

that it.