symbian 9宫格有关问题

symbian 9宫格问题求助
请教一下 九宫格如何写汉字.
  MDesCArray* array = iGrid->Model()->ItemTextArray();
  CDesCArray* cArray = ( CDesCArray* )array;
   
  // The number of items in the grid.
  for ( TInt loop = 0; loop < iNumOfItems; loop++ )
  {
  TBuf<32> sBuf;
  sBuf.Format( _L("%d\Page%d"), loop,loop);
  cArray->AppendL( sBuf );
  }

  // Inform list box that data was added.
  iGrid->HandleItemAdditionL();
自定义了转换的方法可是用上去后就会出现AVKON 0的错误.

------解决方案--------------------
sBuf.Format( _L("%d\Page%d"), loop,loop);

为什么P前面要一个"\"?