title: wpf combobox with checkbox - selecteditem
body: <p>I have a simple ComboBox with CheckBoxes as Items. How can I prevent the actual selection of the items. The user should only be able to check or uncheck the checkboxes? </p>
  
  <p>Currently if I click on an element (not on the content or the check itself) it becomes selected. The problem with this is: The TextProperty of the ComboBox is bound to a value which displays the names of the checked items. But if one ComboBoxItem becomes selected the displayed text becomes the value of the ViewModel of the selected item.</p>
  
  <p>Thanks in advance for any suggestion.</p>