Hi,
I am using inboxSDK to develop chrome extension and I am adding custom button in compose window.
But the same button is not getting added in the replay window when we open an existing email in new window & it is giving below error message.

Open Existing Email in New Window

Error in New Window
NOTE:
Also i had tried the sample app available in inboxsdk and it is adding button in compose window.
But the same button is not getting added in the replay window when we open the existing email in new gmail window.
Please let me know if some had fixed the issue.
Thanks in Advance,