This method is reimplemented for special configuration of PopupDialogs. It never blocks on open, immediately returning OK
if the open is successful, or CANCEL
if it is not. It provides framework hooks that allow subclasses to set the focus and tab order, and avoids the use of shell.open()
in cases where the focus should not be given to the shell initially.
@return the return code
@see org.eclipse.jface.window.Window#open()
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