public class Graph extends FigureCanvas implements IContainer { ... }

public class GraphEditor extends Composite {

	Graph graph = null;

	public GraphEditor(Composite parent, int style) {
		super(parent, style);
		// Graph will hold all other objects
		graph = new Graph(parent, SWT.NONE);
...

Composite graphEditor = new GraphEditor(parent, 1);
		graphEditor.setLayoutData(fd_compositeEditorArea);