EXT radiogroup

我想从根据数据库值动态改变radiogroup选中的状态，后台代码应该怎么写。
还有一个问题也是读数据库的值~然后付给DateField控件。
我的前台代码是这样写的：
                              //单选按钮组
                                       xtype:"radiogroup", 
                                       fieldLabel:'性别',
                                       name:"Editsex", 
                                       items:[{ 
                                           
                                             boxLabel:'男', 
                                             name:'Editsex', 
                                             inputValue:'1' 
                                       },{   
                                           //  checked:true, 
                                             boxLabel:"女", 
                                             name:'Editsex1',
                                             inputValue:'0' 
                                       }]                        //日期控件
                  new Ext.form.DateField({ 
                                    fieldLabel: '出生日期', 
                                    name: 'Edituserbirth', 
                                    width:140, 
                                    format:'Y-m-d' 
                                })