title: Configure ListBox in WPF so that I will be possible to select multiple items without holding CTRL key
body: <p>I have a Listbox that allows user to select multiple items. Normally user can do that by holding CTRL key and clicking the item he or she wants to select.</p>
  
  <p>Is it possible to configure this listbox so that the user will not have to hold the CTRL key when selecting items ? So that he or she will just click the item (without holding anything) and the item will be selected(diselected if it was selected previously) ?</p>
  
  <p>Thank you</p>