x++ Add new line in transfer order ?

Hello .

I need to add new line in transfer order by x++ 

I do it because i will add the item number through the barcode so i need after user insert qty , a new empty line inserted , to scan a new item , and after user insert qty again new line inserted , so i need to call new command in code

i found this 

CopyOfAddButton.command(260);

CopyOfAddButton is the Commandbutton  

Thank you