title: Convert ComboBox selection event to Checkbox toggle
body: <p>I have a ComboBox that has a check box and a text block inside it.</p>
  
  <p>I would like that when an item in the ComboBox is selected, the state of CheckBox contained by the ComboBox item is toggled.</p>
  
  <p>I have looked a fair bit here and elsewhere on the internet but I didn’t find anything specific to this.</p>
  
  <p>Please help. Thanks.</p>