Add-in Problem while loading muliple documents

Hello,
i am developing one word-addin through C# in which there is one
commandbar, which contains three button. every button having some
control. while i m opening multiple document my button click event is
not fired for every document.my button click event is fired only for
the 1st document and for others documents the event is not fired. So,
please tell me for that wht I have to do.

Thanks,
Prasanta

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