title: How to show a dialog on click of a combobox item using MVVM?
body: <p>I am having a combo box control in which I had inserted three items(For instance X,Y,Z respectively). I want to show a dialog when "X" item in the combobox is clicked. In order show a dialog upon click on "X" item, I was able to handle it in "SelectionChanged" event. But the problem here is when I click on the same item no event is getting triggered and as a result I am not able to show a dialog on click on "X" item.</p>
  
  <p>How can I accomplish this issue using MVVM pattern.</p>
  
  <p>I am very new to WPF, please be kind with your answers.</p>