label.setFont( new  Font(Display.getDefault(), "Verdana",  10 , SWT.BOLD));

 public   final   class  MyApp  extends  ApplicationWindow {
     public  MyApp() {
         super ( null );
    }

     protected   void  configureShell(Shell shell) {
         super .configureShell(shell);
        shell.setImage( new  Image(Display.getCurrent(), "c:/..."));
        setShellStyle(SWT.DIALOG_TRIM | SWT.APPLICATION_MODAL);
        shell.setSize( 800 ,  600 );
        shell.setLocation(Display.getCurrent().getBounds().width/ 2  -  400 ,
                Display.getCurrent().getBounds().height/ 2  -  300 );
      }

     protected  Control createContents(Composite parent) {
        ...
         return  parent;
    }
....
}