public SortedTreeModel(ITreeModel innerModel)
{
_innerModel = innerModel;
_innerModel.NodesChanged += new EventHandler<TreeModelEventArgs>(_innerModel_NodesChanged);
_innerModel.NodesInserted += new EventHandler<TreeModelEventArgs>(_innerModel_NodesInserted);
_innerModel.NodesRemoved += new EventHandler<TreeModelEventArgs>(_innerModel_NodesRemoved);
_innerModel.StructureChanged += new EventHandler<TreePathEventArgs>(_innerModel_StructureChanged);
}