Dear
I am quite new to Notes Client dev. Actually I have two questions:
- about Notes Client extension point:
Now I got a task to add a toolbar button into Notes Client when creating a new email, together with ‘send’, ‘cancel’ etc. But I dont know what extension point it is, can any expert help to point out? or where/how I can find it?
- As a handler of the button click event, I need to get the fields value of the creating email, like receviers, cc, subject, attachment, etc. In my understanding, this email has not been saved, so I can not get it from email database, then how I can get the values?
Thanks a lot! 
Subject: No thanks
Hi,
If I understand you correctly you are given a task to alter the buttons in a mail that is being created. If so that means altering the memo-form of the mail-application which usually is considered to be a bad idea partly because it is a standard application and changes will be lost in a upgrade.
If you however want to solve the task, think about other options such as another mail-form in a regular app and use the notesuidocument-handle to get the values you are interested in.
Good luck
Subject: use NotesUIDocument in 8.5.1
Palle, thanks for your information.
Yes, I solved it by using the new java ui api in Notes 8.5.1, which has the NotesUIDocument class.