Thank you for the reply, Ken. I got the answers for my question. But that's
not the end, i still have a question:
How to change control image by code, in getImage callback? How about multiple
inspector?
As what i understand, we can call IRibbonUI::InvalidateControl("myctrlid")
make the control initialize and get in callback function again, then set the
image we wanted. But in multiple inspector, all control id are "myctrlid", if
i call InvalidateControl, all inspector's getImage callback will fire, i
don't know how to process it. I checked the IRibbonControl::GetContext, and
compare it with active inspector, if equal, set the new image, if not, return
old one, question is that how to know which is the old one, If i open 10
inspector, should there be 9 old images? How to process? I'm quite confused.

Ken Slovak - [MVP - Outlook] wrote:
If you look at the ribbon stuff I told you to look at you will see that
there are separate GetCustomUI() callbacks for messages in create and read
modes. So you can supply different XML for each type. One provides
"Microsoft.Outlook.Mail.Read" and the other provides
""Microsoft.Outlook.Mail.Compose" as the RibbonID argument.

There is no way to get or handle any callbacks for any custom ribbon control
not created by you. If that's what you want forget about it.

If what you want is to handle clicks on built-in ribbon controls that is
repurposing the controls, and there are articles on how to do that. Just
google for "repurpose ribbon controls".

Many of these questions are already answered if you look at the materials
that are available.

Thank you for reply, Ken. Ribbon is quite strange to me, i'm trying at my
best, now two questions, 1.)How could i load two different xml file for
[quoted text clipped - 10 lines]
pls
help me out? thanks.

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