public void createPartControl(Composite parent) {
		// make a grid layout with two columns: one for a table, the other for a composite containing buttons
		GridLayout layout = new GridLayout(2, true);
		parent.setLayout(layout);

		// create the composite containing the table. we make a composite to use TableColumnLayout
		Composite comp = createHeaderTable(parent);
		comp.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false, 1, 1));

		// create a composite for rows of buttons
		comp = new Composite(parent, SWT.NONE);
		layout = new GridLayout(1, true);
		comp.setLayout(layout);
		Button b = new Button(comp, SWT.PUSH);
		b.setText("create");
		b.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, false, false));
		b = new Button(comp, SWT.PUSH);
		b.setText("remove");
		b.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, false, false));
		b = new Button(comp, SWT.PUSH);
		b.setText("move up");
		b.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, false, false));
		b = new Button(comp, SWT.PUSH);
		b.setText("move down");
		b.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, false, false));
		comp.setLayoutData(new GridData(SWT.FILL, SWT.FILL, false, false, 1, 1));
		comp.pack();
	}