exLabel.setText(Messages.InfoPropertyPage_labelExpression);
exLabel.setLayoutData(""); //$NON-NLS-1$
exViewer = new ExpressionViewer(page, SWT.MULTI);
exViewer.getControl().setLayoutData("h 100%!, w 100%!"); //$NON-NLS-1$
final ExpressionInput exInput = new ExpressionInput(getSchema());
exInput.setBinding(String.class);
exViewer.setInput(exInput);
exViewer.refresh();
setExpression(getLabelProperty());