Thickness of horizontal lines in ListCtrl and TreeListCtrl differ

Dear list members,

One user of Task Coach was requesting horizontal lines in the task viewers to better differentiate between different tasks, so I tried the wx.LC_HRULES and wx.TR_ROW_LINES styles for the ListCtrl and TreeListCtrl respectively. Unfortunately, they look quite differently, see attached screenshots. This is on Windows XP, wxPython 2.6.2.1, python 2.4.1. Is there anything I can do to make the lines in the TreeListCtrl thinner?

Cheers, Frank

treewithlines.PNG

listwithlines.PNG