+If you'd like to embed bitmaps with alpha transparency in your program, neither
+XPM nor BMP formats are appropriate as they don't have support for alpha and
+another format, typically PNG, should be used. wxWidgets provides a similar
+helper for PNG bitmaps called wxBITMAP_PNG() that can be used to either load
+PNG files embedded in resources (meaning either Windows resource section of the
+executable file or OS X "Resource" subdirectory of the application bundle) or
+arrays containing PNG data included into the program code itself.