wx python 3.0.2 classic 'CheckListBox' object has no attribute 'GetItemHeight'

wxPython Users
1

Investigating porting my wx 2.8 python app to wx 3.0.2 classic (it’s about time) and run into this hurdle. Apparently the GetItemHeight is not part of CheckListBox class anymore:

bash\basher\patcher_dialog.py:519: wxPyDeprecationWarning: Accessing deprecated property.
  mouseItem = (event.m_y/self.gPatchers.GetItemHeight() +
Traceback (most recent call last):
  File "bash\basher\patcher_dialog.py", line 519, in OnMouse
    mouseItem = (event.m_y/self.gPatchers.GetItemHeight() +
AttributeError: 'CheckListBox' object has no attribute 'GetItemHeight'

People were using them to get the item hovered upon in a mouse event handler (gPatchers below is a wx.CheckListBox):

def OnMouse(self,event):
    if event.Moving():
        mouseItem = (event.m_y/self.gPatchers.GetItemHeight() + # blows here
            self.gPatchers.GetScrollPos(wx.VERTICAL))
        if mouseItem != self.mouseItem:
            self.mouseItem = mouseItem
            self.MouseEnteredItem(mouseItem)
    elif event.Leaving():
        self.gTipText.SetLabel(self.defaultTipText)
        self.mouseItem = -1
    event.Skip()

So how do I achieve this in wx python 3.0.2 ?

(Asked at SO if anyone wants the points: http://stackoverflow.com/q/37788095/281545)