SendDefault and SendItem should cover both of those buttons.

The command tag is what should be used for repurposing a built-in control.
so that should be OK.

I just played with this on a Mail.Compose form. I was also able to handle
the idMso="SendItem" button but not the idMso="SendDefault" button. I'm
doing some more digging on this but so far it looks like that button is not
able to be repurposed.

Does an alternative of handling the item.Send() event work for you?

--
Ken Slovak
[MVP - Outlook]
http://www.slovaktech.com
Author: Professional Programming Outlook 2007.
Reminder Manager, Extended Reminders, Attachment Options.
http://www.slovaktech.com/products.htm


"GR" wrote in message
...

Here are the XML strings and their results that I've tried without
success:

#1

customUI xmlns="http://schemas.microsoft.com/office/2006/01/
customui"
commands
command idMso="SendDefault" onAction="SendButton_Action" /
/commands
/customUI

RESULT: My callback function ("SendButton_Action") never gets called
when pressing the large "Send" button on the form nor when pressing
the "Office/Send" menu item.


#2 (using SendItem instead of SendDefault)

customUI xmlns="http://schemas.microsoft.com/office/2006/01/
customui"
commands
command idMso="SendItem" onAction="SendButton_Action" /
/commands
/customUI

RESULT: My callback function ("SendButton_Action") never gets called
when pressing the large "Send" button on the form. It DOES get called
when pressing the "Office/Send" menu item.


#3

customUI xmlns="http://schemas.microsoft.com/office/2006/01/
customui"
ribbon
tabs
tab idMso="TabAppointment"
group idMso="GroupSend"
button idMso="SendDefault"
onAction="SendButton_Action" /
/group
/tab
/tabs
/ribbon
/customUI

RESULT: When the code that sets the XML runs, Outlook pops up an error
box:

(when using SendDefault: button idMso="SendDefault"
onAction="SendButton_Action" /)

"Custom UI Runtime Error"
"controls in a built-in group cannot be modified:
SendDefault"


(when using SendItem: button idMso="SendItem"
onAction="SendButton_Action" /)

"Custom UI Runtime Error"
"controls in a built-in group cannot be modified:
SendItem"


So the code that sets the XML string always gets called but so far,
nothing seems to capture that large Send button on the form when you
create a Meeting request.


Thanks.