private void UnbindModelEvents()
{
_model.NodesChanged -= new EventHandler<TreeModelEventArgs>(_model_NodesChanged);
_model.NodesInserted -= new EventHandler<TreeModelEventArgs>(_model_NodesInserted);
_model.NodesRemoved -= new EventHandler<TreeModelEventArgs>(_model_NodesRemoved);
_model.StructureChanged -= new EventHandler<TreePathEventArgs>(_model_StructureChanged);
}