Capturing changes to MailItem.SendUsingAccount property in Outlook

I am working on an Outlook extension that requires making a change to a 开发者_StackOverflow中文版MailItem open in a compose window if the SendUsingAccount property is changed via the GUI. I would like to be albe to apply my changes automatically, but I cannot find any events that are raised when the user makes the change. I have tried listening to the following events with no success:

• mailItem.PropertyChange
• mailItem.CustomAction
• mailItem.CustomPropertyChange

Are any events raised when the SendUsingAccount property changes?

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No, is the short answer. You could hack up a timer to check for the change on the property. Marcus