tryExpand method
Implementation
bool tryExpand([PanelSibling direction = PanelSibling.both]) {
  assert(_paneState != null, 'ResizablePaneController is not attached');
  return _paneState!.tryExpand(direction);
}bool tryExpand([PanelSibling direction = PanelSibling.both]) {
  assert(_paneState != null, 'ResizablePaneController is not attached');
  return _paneState!.tryExpand(direction);
}