title: Get combobox set value as string
body: <p>Found several ways to do so, but none of them works for me..
  I have a combobox with variable number of options (taken from dynamic xml file). For next, I need to know what the user choosed, and I cant find out how to do it. This is one of ways I found and tried:</p>
  
  <pre><code>string myString = myCombobox.SelectedValue.ToString();
  </code></pre>
  
  <p>At least I dont get an error, but when I try to show that string, it does nothing.</p>