AbstractSelectionStrategy preLayoutSelection = new SelectEditedEntities(this);
preLayoutSelection.initSelection();
setPreLayoutSelectionStrategy(preLayoutSelection);
AbstractSelectionStrategy postLayoutSelection = new SelectNodes(this, fSelectedNodes);
postLayoutSelection.initSelection();
setPostLayoutSelectionStrategy(postLayoutSelection);
}
/**
* Keep the selected nodes, their parents, and descendants. The other nodes in the graph