how to use modal dialog boxes?

Hi,

I want to use a modal DialogBox and used setModal.

The GUI makes it modal, but my code after dialog.center (); gets
executed immediately.

How can I do it so that code execution waits? Must I do this with
asynchronous calls? Can you give an example?

The application is a chess game. When a pawn reaches the last row, the
user should first select a figure (queen, rook, ...), and the move
should not be completed before this selection has finished...

Thanks
Magnus

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