新手问个BREW MP中GridWidget的有关问题

新手问个BREW MP中GridWidget的问题
最近开始学做BREW MP，基础太差，许多东西还是一头雾水。昨天开始写个Grid Widget的例子，想简单的只显示个Static就好，可水平太差不知道怎么写。在Wizard生成的代码的基础上参考了 http://topic.csdn.net/u/20091123/18/3c67c251-79c0-45cf-b799-08ca40a839a5 一帖中两位仁兄的代码，现写出如下代码，请各位大哥看看小弟哪里写的有问题，谢谢了。

/*=============================================================================
FILE: GridWidgetSample.c
=============================================================================*/

/*-----------------------------------------------------------------------------
Includes and Variable Definitions
-----------------------------------------------------------------------------*/
#include "AEEModGen.h"
#include "AEEAppGen.h"
#include "AEEShell.h"

#include "GridWidgetSample.bid"
#include "GridWidgetSample_res.h"

/* some property definition, like AEERect, ect. */
#include "AEEWProperties.h"

#include "AEERootContainer.h"
#include "AEECLSID_ROOTCONTAINER.bid"

#include "AEEDisplayCanvas.h"
#include "AEECLSID_DISPLAYCANVAS.bid"

#include "AEEListWidget.h"
#include "AEECLSID_GRIDWIDGET.bid"

#include "AEEStaticWidget.h"
#include "AEECLSID_STATICWIDGET.bid"

#include "AEEIDecorator.h"

#include "AEEIVectorModel.h"
#include "AEECLSID_VECTORMODEL.bid"

#ifndef RELEASEIF
#define RELEASEIF(p) ReleaseIf((IBase**)(void*)&p)

//#define ERR_TRY(x) do { nErr = (x); if (nErr) goto ERR_CATCH; } while(0)

static void ReleaseIf(IBase **ppif) {
  if (*ppif) {
  IBASE_Release(*ppif); 
  *ppif = 0;
  }
}
#endif

/*-----------------------------------------------------------------------------
Applet Structure
-----------------------------------------------------------------------------*/
typedef struct _GridWidgetSample {
  AEEApplet applet;
  IDisplay * piDisplay;
  IShell * piShell;
  AEEDeviceInfo deviceInfo;
  // Add your own variables here...
IRootContainer *picRootContainer;
IWidget *piwRootWidget;

} GridWidgetSample;

/*-----------------------------------------------------------------------------
Function Prototypes
-----------------------------------------------------------------------------*/
static boolean GridWidgetSample_HandleEvent(GridWidgetSample* pMe, AEEEvent eCode, uint16 wParam, uint32 dwParam);
boolean GridWidgetSample_InitAppData(GridWidgetSample* pMe);
void GridWidgetSample_FreeAppData(GridWidgetSample* pMe);
static void GridWidgetSample_DrawScreen(GridWidgetSample * pMe);

/*-----------------------------------------------------------------------------
Function Definitions
-----------------------------------------------------------------------------*/

/*=============================================================================
FUNCTION: AEEClsCreateInstance
=============================================================================*/
int AEEClsCreateInstance(AEECLSID ClsId, IShell * piShell, IModule * piModule, 
void ** ppObj)
{
  *ppObj = NULL;

  if( AEECLSID_GRIDWIDGETSAMPLE == ClsId ) {
if( TRUE == AEEApplet_New(sizeof(GridWidgetSample),
  ClsId,
  piShell,
  piModule,
  (IApplet**)ppObj,
  (AEEHANDLER)GridWidgetSample_HandleEvent,
  (PFNFREEAPPDATA)GridWidgetSample_FreeAppData) ) {
 

if(TRUE == GridWidgetSample_InitAppData((GridWidgetSample*)*ppObj)) {