Thank you for writing.
First I want to say that you can do these operation (add, edit) directly in the grid. You do not need any additional controls or files to edit the information.
Nevertheless following the information that you have provided, I have created a small sample project where you can add and edit rows upon a button press. Feel free to use or change it in any way that is suitable for your case.
Also you may find the following help section very useful:
I hope this information helps. Should you have any other questions, I will be glad to assist you.
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