GridLayout pageLayout = new GridLayout();
pageLayout.numColumns = 1;
parent.setLayout(pageLayout);
// bottom composite containing main diagram
renderer = new View(parent, SWT.NONE, this);
renderer.setLayoutData(
new GridData(SWT.FILL, SWT.FILL, true, true));
// Configure the rendering pipe before listening for changes.
renderer.setGraphModel(getViewGraph(), getJungGraph(), getNodeRanking());