final Text textPort = new Text(composite, SWT.BORDER);
textPort.setText("");
textPort.setLayoutData(new GridData(SWT.FILL, SWT.TOP, true, false));
// Verify if the value entered is numeric
textPort.addVerifyListener(new NumberVerifyListener());
Label domain = new Label(composite, SWT.NONE);
domain.setText("Domain");
domain.setLayoutData(new GridData(SWT.TRAIL, SWT.TOP, false, false));