// DoFloodFill
// Fills with the colour extracted from fillBrush, starting at x,y until either
// a color different from the start pixel is reached (wxFLOOD_SURFACE)
// DoFloodFill
// Fills with the colour extracted from fillBrush, starting at x,y until either
// a color different from the start pixel is reached (wxFLOOD_SURFACE)