def showEvent(self, event):
        """
        Sets the visible state for this widget.  If it is the first time this
        widget will be visible, the initialized signal will be emitted.
        
        :param      state | <bool>
        """
        super(XView, self).showEvent(event)
        
        # record the visible state for this widget to be separate of Qt's
        # system to know if this view WILL be visible or not once the 
        # system is done processing.  This will affect how signals are
        # validated as part of the visible slot delegation
        self._visibleState = True
        
        if not self.isInitialized():
            self.initialize()
        
        # after the initial time the view is loaded, the visibleStateChanged
        # signal will be emitted
        elif not self.signalsBlocked():
            self.visibleStateChanged.emit(True)
            QTimer.singleShot(0, self.shown)
Sets the visible state for this widget.  If it is the first time this
        widget will be visible, the initialized signal will be emitted.
        
        :param      state | <bool>