ThumbStyleRadioButton
button = new ThumbStyleRadioButton("Block thumb", B_BLOCK_THUMB);
button = new ThumbStyleRadioButton("Triangle thumb", B_TRIANGLE_THUMB);
ThumbStyleRadioButton* button = dynamic_cast<ThumbStyleRadioButton*>(
ThumbStyleRadioButton(const char* label, enum thumb_style style)
class ThumbStyleRadioButton;