HScrollBar
BScrollBar* HScrollBar() const;
BScrollBar* hScrollBar = window->PoseView()->HScrollBar();
if (PoseView()->HScrollBar() != NULL) {
hScrollBarContainer->GroupLayout()->AddView(PoseView()->HScrollBar());
BSize size = PoseView()->HScrollBar()->MinSize();
if (HScrollBar()) {
HScrollBar()->GetRange(&min, &max);
HScrollBar()->SetValue(min);
BScrollBar* HScrollBar() const;
BPoseView::HScrollBar() const