Auto-complete textbox when an item is selected in a combobox

Hi everybody,

this is my first question, I hope to have the answer I am loooking for. In my datagridview I have to columns: a combobox bound to a binding source (displaymember and valuembers set correctly), and a textbox, which I want to be filled automatically with the value of the valuemember property of the combobox, as soon as the user selects an item in the combobox and presses a key (usually TAB, to move to the next item)...how can I do it?

Thanks in advance to everyone

koolk

Francesco