After receiving some comments to my previous post (well, in fact it was my intention to get some feedback on it how to do that properly), here is the way to get your new fields of your table to your form's datasource:
after you have added the fields in the table and saved the table, go to the form where the table is used as a datasource, right click on it and select "Restore". After that, you will have your new table fields available in your form's datasource.
A big thanx to denis and jamie for providing me comments on that !
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