Traceback (most recent call last):
  File "./miniframe.py", line 484, in OnLeftDown
    tab = self.FindTabAtPos(mposx, mposy)
  File "./miniframe.py", line 582, in FindTabAtPos
    if self.TabHitTest(selTab, x, y):
  File "./miniframe.py", line 591, in TabHitTest
    tabRegion = tab.GetTabRegion()
AttributeError: 'NoneType' object has no attribute 'GetTabRegion'
Traceback (most recent call last):
  File "./miniframe.py", line 514, in OnLeftUp
    if self.CheckTabClose(selTab, mposx, mposy):
  File "./miniframe.py", line 549, in CheckTabClose
    closeBtnReg = tab.GetCloseButtonRegion()
AttributeError: 'NoneType' object has no attribute 'GetCloseButtonRegion'