Saki's Upload Panel not doing POST

[incanus]

Hi,
i'm trying to use a UploadPanel to upload files, but it is not sending any post parameters. Either the baseParams not the file is being sent. I'm doing something wrong?

new Ext.Panel({
                        height:200
                        ,minWidth:165
                        ,id: 'xFile'+perfil
                        ,layout:'fit'
                        //,anchor:'60%'
                        ,border:false
                        ,closable:false
                        ,iconCls:'icon-upload'
                        ,fileUpload:true
                        ,items:[
                            {
                            xtype:'uploadpanel'
                            ,buttonsAt:'tbar'
                            ,autoScroll:true
                            ,id:metadato+perfil
                            ,url:g_HttpRelativeWebRoot + 'idcplg?IdcService=CHECKIN_UNIVERSAL' 
                            ,path:'root'
                            ,maxFileSize:1048576
                            ,baseParams:{
                                cmd:'add_file',
                                dDocTitle:'',
                                dDocType: perfil,
                                dSecurityGroup: 'GS_EM_HEADER',
                                op:'addDocument'
                                ,dDocName:''
                                ,dID: ''
                                ,xComments: ''
                            }    
                            ,enableProgress:false
                            ,singleUpload:false
                        }]
                    });

EDIT: I'm using Ext Js 3.2.1

[incanus]

in fact, it's doing a GET action. where ir could be configured?