title: IsEditable="true" not Showing in Combobox in windows phone 8.1?
body: <p>I want to perform a search on a <code>combobox</code>. I use this code:</p>
  
  <pre><code> &lt;ComboBox x:Name="rechargeOperator1"   
             BorderBrush="#FFABAABF" 
             Margin="10,80,10,0" 
             Height="44" 
             BorderThickness="0,0,0,2" 
             VerticalAlignment="Top" 
             PlaceholderText="Select Operator"
             RenderTransformOrigin="0.5,0.5"  
             Background="Black" &gt;
  &lt;/ComboBox&gt;
  </code></pre>
  
  <p>I googled that I need to use "IsEditable="True" on the Combobox but i'm not getting <code>IsEditable="true"</code> option on the combobox in the Xaml file.</p>
  
  <p>please anyone help me to do this</p>