title: c# combobox selectedindex display
body: <p>I have a two combobox's on the same tab of a tab control. One combobox has as a SelectedIndexChanged event and in that event, the code tries to change the index of the second combobox. 
  The code uses: </p>
  
  <pre><code>int index = comboB_DS_Term_Type.FindString("Test1");
  comboB_DS_Term_Type.SelectedIndex = index;
  </code></pre>
  
  <p>But nothing is displayed in the combobox</p>
  
  <p>If I use: </p>
  
  <pre><code>comboB_DS_Term_Type.SelectedIndex = 2;
  </code></pre>
  
  <p>The correct item is displayed in the combobox
  I can set a breakpoint and check the value of the index is valid 
  but nothing is displayed in the combobox
  I have tried to refresh the combobox but still, nothing is displayed</p>