Where should the GWT dialog title be set? -

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is the title (or caption) of the GWT dialog "Remote Procedure Call" on the demo app, can I set it somewhere else If yes, then where?

... or do I have to use a subclass?

If you do not want to use subclass, you can use the 'text' property of the dialog box can do. 

  dialogBox.setText ("text");

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