Key Events not Working in IE

Hi,

In My Application there is Search field which makes an Ajax request to the Server, After Ajax request completion it shows the Auto Suggest list.

selenium.keyUp(locator, keySequence);

This event is working in Firefox, but not in IE.

If i used

selenium.keyPressNative(String.valueOf(KeyEvent.VK_ENTER));

command if the search term present it was displaying, otherwise not.

But I want to Auto Suggestion list, not that direct search element because if there is any similar search terms it selected the exact search term only by using of this KeyPressNative command.

I want to how to call the Ajax Call events in IE.

Please Help me its urgent.

Thanks in Advance.
Siva Prasad Chinta