Tabsheet +Navigator

My application has Tabsheet as main view , how to use the navigator in this case?

You can give your Navigator a ViewDisplay, like so:

Navigator nav = new Navigator( UI.getCurrent(), new ViewDisplay()

        public void showView( View view )
            // TODO Auto-generated method stub
    } );

[/code]From here, you can take the View parameter passed into the showView method, and add it as a Tab to your Tabsheet.