XRCed and ListCtrl - manually added columns doesn't appear

[Frank Aune]

Hello,

I've got a ListCtrl defined in an XRC, and I retrieve the object from the XML 
and append columns manually:

self.listCtrl = xrc.XRCCTRL(self.panel, 'listctrl')
self.listCtrl.InsertColumn(0, 'Col 1')
self.listCtrl.InsertColumn(1, 'Col 2')
self.listCtrl.InsertColumn(1, 'Col 3')

But these columns never appears in the GUI. I can append strings to column one 
though, but the column name doesnt appear on top of the listctrl.

Is there something I've misunderstood, or shouldn't this simply "just work"?

Thanks,
Frank