title: WPF Combobox Background for Different Selected item
body: <p>I have Combobox with Just 3 item : Planing, Progress and Done,</p>
  
  <pre><code>&lt;ComboBox SelectedIndex="0&gt;
      &lt;ComboBoxItem Content="Planing"/&gt;
      &lt;ComboBoxItem Content="Progress"/&gt;
      &lt;ComboBoxItem Content="Done"/&gt;
  &lt;/ComboBox&gt;
  </code></pre>
  
  <p>How Can i Change Background Color Of ComboBox (which is by defult Gradiant) Depend on Which Item is Selected.</p>
  
  <p>For Example : purple for Planing, blue for Progress and Green for Done.</p>
  
  <p>Note: I mean ComboBox Background, not ComboBox Items List.</p>
  
  <p>Thanks</p>