[wxPy] Why I can not change a ListItem property?

[David]

I have la ListCtrl in LC_REPORT mode and i need to change the color of a
single cell.
I tried to set the ListItem properties like this

item = wx.ListItem()
item.SetId(currId)
item.SetColumn(currCol)
item.SetText(text)
item.SetTextColour(wx.RED)
mylistctrl.SetItem(item)

but the .SetTextColor doesn't seem to do anything.
How can I change properties of a single cell?
Where can i find more detailed documentation? I read the documentation at 
http://docs.wxwidgets.org/stable/wx_wxlistitem.html#wxlistitem
but I can not figure out how and when I am supposed to use the 'm_mask'
property.

TIA

David.