title: PySide (Qt): How to set background color of button's tooltip?
body: <p>I've just got a fast question:</p>
  <p>How to set a color  of button's tooltip?</p>
  <h3>code</h3>
  <pre><code>    btnExample = QtGui.QPushButton('Example button', self)
      btnExample.setStyleSheet(&quot;color: rgb(0, 255, 0)&quot;)
      btnExample.clicked.connect(function_of_button)
      btnExample.setToolTip('Animated splines toolkit') # I'd like to change colors here
  </code></pre>
  <p>It's PySide, Python, I've got light gray text on button, so the text on tooltip is also light.<br />
  I've got to change it's background to black</p>