title: Qt QComboBox - change current index not as expected
body: <p>I would like to have a given item in comboBox selected when opening editor, and when loading given data that should update in editor. Combobox is not working as expected! </p>
  
  <p>I have these lines for having given item selected when I open the window:</p>
  
  <pre><code>normBox = new QComboBox(page1);
  gridBox-&gt;addWidget(normBox, 2, 1, 1, 1);
  QStringList normsLst;
  normsLst.append(tr("sum"));
  normsLst.append(tr("maxF"));
  normsLst.append(tr("sumF"));
  setComboBoxItems(normsLst, m_normBox);
  m_normBox-&gt;setCurrentIndex(0);
  </code></pre>
  
  <p>but first item 'Sum' is not displayed in combobox when I create editor.</p>
  
  <p>Then, I implemented my 'load' function, which should load the saved data in interface ending with a refresher:</p>
  
  <pre><code>normBox-&gt;setCurrentIndex(model-&gt;getNormIdx());
  </code></pre>
  
  <p>where model has accurate member normIdx.</p>
  
  <p>How can I achieve the right selection in combo box with Qt?</p>