UNDO/REDO in EXTJS (sencha) window

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ASP.NET

HI
the application contains the sample.aspx. if i click the any button the sample.aspx page in opening in popup in EXT window. The sample.aspx page contains the two textboxes. here i cant do undo and Redo functionlites in those textboxes

The EXTJS code is like this. please refer below code

function TaskshowPopWindow(windowTitle, htmlText, width, height) {

        parent.win3 = new parent.Ext.Window({
            html: htmlText,
            title: windowTitle,
            width: width,
            height: height,
            closeAction: 'hide',
            bodyStyle: 'background:white; padding: 10px;',
            progress: true,
            modal: true,
            resizable: false,
    parent.win3.show();
}

in that above function i am passing the sample.aspx page name as htmltext parameter and passing the height and width,title.

the button containg the following java script functions. in the function i am calling the TaskshowPopWindow functions

function popup()
{
TaskshowPopWindow('sample','sample.aspx',200,200)
}

Here

if i click the button the aspx page getting open in a extjs window.
in the page has two text boxes. in those textboxes i cant able to do undo/redo operatios.. is there any prpoerty for UNDO/REDO in EXTJS