altKeyDown is not working after uograde smartclient libs

[kevincy]

Hi, guys
we have problem with altKeyDown in selenium.

SmartClient Version: 08-16-2011

isc.HLayout.create({
    ID:"HL",name:"HL",
    title:" ",showResizeBar:false,
    height:1,width:"100%",members:
    [ 
       isc.HLayout.create({
           ID:"HLMI",name:"HIMI",
           title:" ",showResizeBar:false,
           height:1,width:"100%",
           defaultLayoutAlign:"center",members:
               [ isc.MenuButton.create({
                    ID:"admin",canFocus:true,
                    accessKey:"A",hiliteAccessKey:false,
                    title:"Admin",showDown:true,
                    showFocused:false,showEmptyMessage:false,
                    showRollOver:true,autoFit:true,
                    baseStyle:"CwMEIDef",align:"top",
                    showMenuButtonImage:true,
                    menu:isc.Menu.create({
                         ID:"admin$menu",fastCellUpdates:false,
                         canFocus:true,showSelectedStyle:true,
                         title:"Admin ",showDown:true,
                         data:
                            [ {keys:{keyName:"W",shiftKey:false,ctrlKey:false,altKey:true},
                               title:"Event Log (Alt+W)",ID:"EventLog",
                               cwIndex:0,auditor:"",
                               _baseStyle:"CwMEIDefItem",
                               click: "isc.say('The Eventlog Menu is triggered')",
                               showDown:true,showOver:true}
                             ],
                        showRollOver:true,vAlign:"bottom"
                        })
                 })]})]});

css:

.CwMEIDef {
color:black;
cursor:pointer;
font-size:9pt;
font-style:normal;
font-weight:bold;
padding:4px;
}

.CwMEIDefItem {
color:black;
cursor:pointer;
font-size:9pt;
font-style:normal;
font-weight:bold;
padding:4px;
}

Steps to reproduce:

press Alt+W, a messgae dialog will be poped up and shows 'The Eventlog Menu is triggered'.
Before upgrade smartclient libs, we call selenium.altKeyDown() + selenium.keyPress(locator,"W"), the dialog can be seen.
But after uograding, no dialog is poped up, and nothing is changed in selenium.