Expand table rows in protected sheet

Hi,

I am stuck in something I am sure it is easy but cannot get with the solution...

I have a table that when the sheet is unprotected I can insert easily a row by pressing the "Tab" key when the last cell from the table is selected. But this I cannot do it when the sheet is protected!

Any ideas? I have attached an example.

Hope someone can help me on this.

Thanks,