layout.numColumns = 2;
    protected Control createContents(Composite parent) {        Composite composite = new Composite(parent, SWT.NONE);        GridLayout layout = new GridLayout();        layout.numColumns = 2;        composite.setLayout(layout);        GridData data = new GridData(GridData.FILL);        composite.setLayoutData(data);        addFirstSection(composite);        addSeparator(composite);        addSecondSection(composite);        return composite;    }