void DoGetTextExtent(const wxString& string, wxCoord *x, wxCoord *y,
wxCoord *descent = NULL,
wxCoord *externalLeading = NULL,
- wxFont *theFont = NULL) const;
+ const wxFont *theFont = NULL) const;
void DoGetSize(int* width, int* height) const;
void DoGetSizeMM(int *width, int *height) const;