Popup Screen with Transparent Background

public class popup extends PopupScreen
{

popup()
{
    super(new HorizontalFieldManager());

    setBackground (BackgroundFactory.createSolidTransparentBackground (Color.WHITE, 0));
    setBorder (BorderFactory.createRoundedBorder(new XYEdges(),Color.BLACK,2));


   //Here you can add Fields to the popup Screen.

}

}

Creating Popup Screen in Blackberry

UiApplication.getUiApplication().pushScreen(new MyPopup());

public class MyPopup extends PopupScreen{

public MyPopup() {

super(new VerticalFieldManager(), Field.FOCUSABLE);

add();//add Fields (checkbox , radio buttons.......)  here.

}