I want to add Web Dialog Box as a pop up window. When i click to a link then the dialog box should appear.

I have written following code put but unable to add it to the Web dialog box 

DialogWindow dialogWin = getDialogBox(); 

//header

DialogWindowHeader dgWinHeader = dialogWin.getHeader();

dgWinHeader.setCaptionText(

"Some Caption"); 

DialogButton dgMaxButton =

new DialogButtonMaximizeBox();

DialogButton dgMinButton =

new DialogButtonMinimizeBox();

DialogButton dgCloseButton =

new DialogButtonCloseBox();

 dgWinHeader.getChildren().add(dgMaxButton);

dgWinHeader.getChildren().add(dgMinButton);

dgWinHeader.getChildren().add(dgCloseButton);

"normal");

 //how to add it to dialogWin object?