Change item description in SO document using code

Hi,

When you enter a item in SO line, you can override the item description in the description field as follows

by entering the ew description and pressing the CTRL-TAB key.

I am trying to do the same from VB code.

I first launch the SO screen and enter values in the field for Customer code etc.

On the line level i enter the item code and my own description in the item description field and send CTRL-TAB using SendKeys method. But it opens up the Choose from list form.

Is there a way i can enter my own description in the description field using code?

Thanks

Satish.