fairygui做了个ui然后运行显示黑屏啥都看不到

模仿demo来的 
onLoad(){
fgui.addLoadHandler()
fgui.GRoot.create()
fgui.UIPackage.loadPackage("UI/Start/StartDemo",this.onLoadUIComplete.bind(this))
}
onLoadUIComplete(){
fgui.UIPackage.addPackage("UI/Start/StartDemo")
this.view=fgui.UIPackage.createObject("StartDemo","StartUI").asCom
this.view.makeFullScreen()
fgui.GRoot.inst.addChild(this.view)
}
view不为空