virtual void GetTextExtent(const wxString& string, long *x, long *y,
long *descent = NULL, long *externalLeading = NULL,
const wxFont *theFont = NULL, bool use16bit = FALSE) const;
virtual void GetTextExtent(const wxString& string, long *x, long *y,
long *descent = NULL, long *externalLeading = NULL,
const wxFont *theFont = NULL, bool use16bit = FALSE) const;