title: Set selected item for QComboBox
body: <p>I have a simple <code>QComboBox</code> widget, which has 2 values inside: <code>True</code> and <code>False</code>.
  And I have a QString variable <code>currValue</code>, which is one of those values. I want to set my widget's current value with <code>currValue</code>.</p>
  
  <p>I thought that solution is the following:
  first lets initialize currValue;
  <code>QString currValue = "False";</code></p>
  
  <pre><code>QComboBox* combo = new QComboBox();
  combo-&gt;addItem("True");
  combo-&gt;addItem("False");
  combo-&gt;setCurrentIndex(combo-&gt;findData(currValue));
  </code></pre>
  
  <p>But it doesn't work.
  Am I doing something wrong ?
  And Why QComboBox has no member setCurrentItem() or smth like that ? </p>