[wxPython] Differences in wxGTK and wxMSW operations

I am doing the following:

Creating a class subclassed from wxDialog with three listboxes in (I'll call
this ListBoxDialog). On one of the list boxes, I override the EVT_LISTBOX
handler as so:

        # Add List Box for Register Masks
        self.regMaskLB = wxListBox(self,
                                   iId,
                                   wxDefaultPosition,
                                   wxDefaultSize,
                                   map(lambda x: x[1], self.aReg),
                                   wxLB_SINGLE)
        EVT_LISTBOX(self, iId, self.EvHRegMaskLB)
        self.regMaskLB.SetSelection(0)
        listBoxBoxSizer.Add(self.regMaskLB, 0, wxALIGN_TOP)

The event handler looks like this (modified a bit to cut the clutter, plus
in real life I am not using a wxMessageDialog):

    def EvHRegMaskLB(self, event):
        iListBoxIdx = self.regMaskLB.GetSelection()
        dlg = wxMessageDialog(self, self.aReg[iListBoxIdx][1])
        if dlg.ShowModal() == wxID_OK:
    pass
        dlg.Destroy()

        # Handle default
        event.Skip()

This works find on Windoze, but when I run this on Linux/wxGTK, it doesn't
work properly:

Invoke ListBoxDialog. Click on ListBox item. MessageDialog comes up OK,
dismiss using OK or Cancel. If the mouse happens to be in ListBoxDialog with
a y coordinate in the same y coordinate space as the ListBox (note it
doesn't have to be in the listbox), the ListBox item which corresponds with
the mouse y coordinate seems to get automatically selected, and the
MessageDialog pops up again. No clicking or anything needed. Move it up the
list, the selection changes, and I have to dismiss MessageDialog a number of
times.

Note that if I use EVT_LISTBOX_DCLICK it is works the same as Windoze.

I am using wxPython 2.1.13 on Linux and 2.1.15 on Windoze (I didn't upgrade
because I have seen other possible problems using 2.1.15 on Linux/GTK)

Any suggestions?

NOTE: the reply e-mail address may be wrong - please respond to
rcc@jennic.com

Robert Cragie
Design Engineer
Jennic Ltd.
Sheffield Science Park
Sheffield
S1 2NS
Tel: (+44) 114 281 2655
Fax: (+44) 114 281 2951
mailto:rcc@jennic.com