def addPanel(self, title, panel = None):
"""Can add an existing panel, or have a panel created by default.
Adding an existing panel is useful for adding special panel types (splitters/tabs)
"""
if not panel:
panel = Panel()
self.addChild(panel)
panel.moveto(self.innerRect[0], self.innerRect[1])
panel.resize(self.innerRect[2], self.innerRect[3])
panel.calcSize()
panel.tabTitle = title
self.tabPanels[title] = panel
self._tabBar.addTab(title)
if not self.activePanel:
self.activePanel = panel
self.setDirty()
return panel
