@IsDocBeingEdited funktioniert nicht in "Window Title" versuch mal @IsNewDoc...
Auszug aus Designer Hilfe:
@IsNewDoc
This function evaluates the current state of the document when it is used in SmartIcons, button, hide-when, section editor, window title, field, form, and form action formulas. In column, selection, agent, and view action formulas, it always returns a 0.
@IsDocBeingEdited
This function does not work in column, selection, agent, form, or view action formulas. It's intended for use in button, hide-when, field, and form action formulas.