public void ExpandBones(IList <int> expandedIds, IList <TreeViewItem> items)
{
var expandedBones = items.Where(x => expandedIds.Contains(x.id)).Select(y => ((TreeViewItemBase <BoneCache>)y).customData).ToArray();
using (m_Model.UndoScope(TextContent.expandBones))
{
m_Model.SetExpandedBones(expandedBones);
}
}