title: Displaying Image in QmessageBox
body: <p>How can I display an image in a message box. I tried </p>
  
  <pre><code>about.setIcon(":/pics/goku3.jpg");
  </code></pre>
  
  <p>but it gives me errors. I know I can use the built-in about box. Here is the full code for displaying this about box.</p>
  
  <pre><code>void MainWindow::on_actionUmer_s_Program_triggered()
  {
      QMessageBox about;
  
      about.setText("Umer's Program");
      about.setInformativeText("Copyright ; 2012 Umer Software Inc.\nI wrote this program     for fun.\n);
      about.setStandardButtons(QMessageBox::Ok);
      about.setIcon(":/pics/goku3.jpg");   // here is the error
      about.setDefaultButton(QMessageBox::Ok);
      about.show();
      about.exec();
  }
  </code></pre>
  
  <p>Please also tell me how can set the size of that image.</p>