Filter Listgrid data depending on entered value in another cell

Hello there,

I have a listgrid which has 4 columns. Code,Name,Qty and Price. the name cell is a Combo Box which loads the names via datasource. So far all is fine. now i want to be able to enter a code in the Code col cell and then i want the Combo box to display the name in the Name cell and the corresponding Price in the Price cell. Can somebody help me to achieve this.

cheers
Zolf