wx.lib.mixins.listctrl / wx.TextEditMixin set a cell to editable and not-editable

Hi,

is there a method to set a cell to be editable and not-editable?
I figured that i.e. in listctrl.py
TextEditMixin.OnLeftDown
opens the editor, i.e.
self.OpenEditor(col, row)

etc...

So alternatively:
What would be a simple method to implement a condition on which it is
decided whether to call the editor or not?

ThanX,

Tobi