You could create a custom save command and bind it to the Save button command. This way you won't use the default command descriptor and you will be able to handle the opened file.
Here is the default command implementation which you could use in your custom command:
SaveFileDialog saveFileDialog =
saveFileDialog.Filter = FileDialogsHelper.GetSaveFileDialogFilter();
saveFileDialog.FileName = editor.Owner.Workbook.Name;
extension = Path.GetExtension(saveFileDialog.SafeFileName);
(Stream output = saveFileDialog.OpenFile())
WorkbookFormatProvidersManager.Export(editor.Owner.Workbook, extension, output);
I hope this helps.
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