IE Browser Extension using BHO ,I am developing an IE Extension for Gmail.

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I am developing an IE Extension for Gmail. I have to bring my product signature inside the Compose Editor of Gmail and a button down the Tool Bar of Gmail Compose Editor. At First Time when i click on the Compose Button, Gmail's New composers pop up window is opened, I could bring my product signature inside the body of new composer and a button down the Composer.
This code for this is written in OnDocumentComplete Event in BHO using C#. The same thing if i open more than one pop window, for the first window alone the product signature is coming, for other pop up window it is not showing since the OnDocumentComplete event is fired only for the first window alone.If i open more than one window it is not getting fired because of which i am not able to insert the product signature inside body of compose editor for other popup windows.

Does anyone know why the OnDocumentComptete event is not fired when i open more than one compose editor? What would be the solution for this?