ToolBarButton
ToolBarButton* button;
button = new ToolBarButton(NULL, NULL, message);
ToolBarButton(const char* name, const char* label,
ToolBarButton::ToolBarButton(const char* name, const char* label,
ToolBarButton::AttachedToWindow()
class LockableButton : public ToolBarButton {
ToolBarButton(name, label, message)
ToolBarButton::MouseDown(point);