Code to insert rows and lock command button

Hi...Can anyone help with a code to insert a new row when a user starts to type in a cell. In the attached sample workbook when a user starts to type in cell A2 a new blank row should insert and the totals should include the new rows in the calculation. When the user starts to type in A3 then another new row should be inserted etc.

I also have a macro button which I would like to lock so when new rows are inserted or deleted it does not affect the macro button.

Thanks