Thanks and need help - about talbegrid

Thanks a lot that the MVDB Team give me so great tool to record ,list ,analyse the data.I have developed two simple application for my work. when i am doing the development,i have some question,I also get the answer through the forum.
Now, there are 4 questions ,the detail information can be found in the attachment(there are 3 files).

1.why the second way cannot list the record with empty data?
2. how the set up the filter of tablegrid1
3 edit and delete the data
4 the auto-number