合并了两行的 在代码中怎么写呢？

Question

items: [{
layout: "column",
items: [{
buttons: [{
            text:'保存',
            cls: 'x-icon-btn',
            iconCls: 'x-icon-btn-toggle',
            handler: function(){
               this.onSave();
},
scope: this
        }],
columnWidth: .5,
layout: 'form',
defaultType: 'textfield',
items: [this.name,this.brithday,this.identificationChar,
this.politicalstatus, this.workUnit, this.masterData]
},{
columnWidth: .5,
layout: 'form',
defaultType: 'textfield',
items: [this.gender,this.nation,this.origin,this.arbitrationAgency,
this.Department, this.approvedUnit]
}]
}]在items 内容的下面要插入一个textarea 是 合并两列的 怎么写呢？