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#define EVT_FONT_SELECTION_CHANGED(id, fn) DECLARE_EVENT_TABLE_ENTRY( wxEVT_COMMAND_FONT_SELECTION_CHANGED, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxFontSelectorCtrlEventFunction) & fn,
(wxObject *) NULL ),

From

Cover of Cross-Platform GUI Programming with wxWidgets

Note

define EVT_FONT_SELECTION_CHANGED(id, fn) DECLARE_EVENT_TABLE_ENTRY( wxEVT_COMMAND_FONT_SELECTION_CHANGED, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxFontSelectorCtrlEventFunction) & fn,

(wxObject *) NULL ),