Mark the hovered state as being true.

        :param      event | <QtCore.QEnterEvent>

def enterEvent(self, event):
        """
        Mark the hovered state as being true.

        :param      event | <QtCore.QEnterEvent>
        """
        super(XViewPanelItem, self).enterEvent(event)

        # store the hover state and mark for a repaint
        self._hovered = True
        self.update()