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Molecular dynamics by NMR data analysis

Brought to you by: edauvergne, troelslinnet

Mac OS X bug fixes for the GUI ComboBox input elements.

The ComboBox.GetClientData() method on Mac OS X fails if the ComboBox.GetSelection() method returns
-1 (or wx.NOT_FOUND).

Authored by: bugman 2012-05-24

changed	/branches/uf_redesign/gui/input_elements/combo_list.py
changed	/branches/uf_redesign/gui/input_elements/value.py