// constructor Branch-Or-Leaf-Object
public TreeObjectViewModel(TreeObject inObject, TreeObjectViewModel inParent, bool isLeaf) : base(inParent, !isLeaf)
{
_object = inObject;
}
// constructor Branch-Object
public TreeObjectViewModel(TreeObject inObject, TreeObjectViewModel inParent) : base(inParent, true)
{
_object = inObject;
}