how to prevent multiple instances of the same window.


I have developed a gtk application having several
dialog windows. One of the dialogs is the About
dialog. Whenever i click the about menu item, a new
instance of the about dialog pops up. Is there a easy
gtk api, which restricts the creation of multilple
instances of the same dialog.
For example, when the user clicks About menu item
once, and clicks it again after some time, the
previous about dialog should be raised and presented
to him, rather than creating another About dialog

Thanks in advance

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