title: Qt Creator toolbar doesn't appear
body: <p>I can't see the <code>file</code>, <code>edit</code>, <code>Build</code>, <code>Debug</code>, <code>Tools</code>, <code>Window</code> and <code>Help</code> buttons in Qt's IDE, and I dont know why.
  Maybe there is a key combination like <code>ctrl + (a letter or number)</code> to show it, or maybe a problem with the installation.</p>
  
  <p>Specs/other:</p>
  
  <p>Ubuntu 14.04 LTS</p>
  
  <p>GNOME Shell 3.10.4</p>
  
  <p>This is how my IDE looks like, as you see, there is no toolbar.</p>
  
  <p><img src="https://i.stack.imgur.com/U0XRc.png" alt="There is no toolbar!"></p>
  
  <p>What could be the problem?</p>
  
  <p>Thanks in advance.</p>