Interrupt FileSave-Dialog while working with readonly files

While working with read-only files in my Mindmanager AddIn one question came up and I hope you could help.

Scenario:
I open a MindManager file.

The file opens. It is read-only.

Additionally, my document opened event triggers.
Until this point, everything is looking good.
If I make changes to the document and try to save it, a save local file dialog will appear.


Furthermore, saving this document does not trigger the document save events. (I got one OnBeforeCloseEvent and one AfterCloseEvent)
Overview of the events:

After saving the documents with the MindManager File Dialog, the onSave-events trigger. Is there anything i can do, to not show this dialog? My intention is to do my own savefile-dialog.