Hi all!

I use Ext.ux.form.FileUploadField class to upload file. Im looking for ability to cancel uploading, but I didnt find any proper solution.
Mine code:
Code:
function uploadProdWin(param) {    
...


    var editfrm = new Ext.FormPanel({
        fileUpload:true,
        waitMsgTarget:true,
        labelWidth:70,
        bodyStyle:'padding:5px',
        frame:true,
        baseParams:{contentGroupId:contentGroupId, img:param.img},
        items:[
            new Ext.form.FieldSet({
                title:title,
                autoHeight:true,
                defaultType:'textfield',
                items:[
                    {
                        xtype:'fileuploadfield',
                        emptyText:empTxt,
                        fieldLabel:labels.adm_file,
                        name:'content',
                        buttonText:'...',
                        allowBlank:false,
                        width:310,
                        listeners: {
                            fileselected: function (v) {
                               ...
                            }
                        }
                    }
                ]
            })
        ],
        buttons:[
            {text:labels.adm_uploadwindow, handler:function () {
                form.submit({
                    url: rest,
                    waitMsg:labels.adm_wait_upload_file,
                    success:function (f, a) {
                        ...
                    },
                    failure:function (f, a) {
                        ...
                    }
                });
            }
            },
            {text:labels.adm_button_cancel, handler:function () {
                selEdit.close();
            }}
        ]
    });


    form = editfrm.getForm();


    var selEdit = new Ext.Window({
        title:labels.adm_uploadwindow,
        modal:true,
        width:470,
        height:200,
        resizable:false,
        plain:true,
        layout:'fit',
        items:[editfrm]
    });
    selEdit.show();
}
File upload request is async, so if press upload and close window uploading will continue. Its very bad for me. Is there any solution to cancel uploading?

Thanks & regards