title: How create dynamic tooltip for QGraphicsItem pyqt5
body: <p>My override method toolTip() doesn't calls. How do i solve this?</p>
  
  <pre><code>class MyCls(QGraphicsEllipseItem):
  
          def __init__(self, x, y, r):
              super().__init__(x, y, r, r)
              self.setToolTip("Test")
  
          def toolTip(self):
              return "123"
  </code></pre>