Select Rows with the Keyboard

Hey, I have some problems.

How can I get a value from a cel selecting it with the arrows of the keyboard.

somethig like this, but only with the keyboard

// set click action handler
obj.setAction("click", function(src){
var myValue =myData[src.getItemProperty("index")][0];
});

Please

Well, thanks for your help, but I founded a way, and works.

obj.onCurrentRowChanged = function(value){
var row = obj.getCurrentRow();
alert(this.getCellText(0, row) );
};

with this can I get a Value only with the keyboard