其中CSettingListListbox继承自CAknSettingItemList

 1 void CSettingListListbox::EditItemL(TInt aIndex, TBool aCalledFromMenu)
 2 {
 3     if( aIndex == 2 )
 4     {
 5         TBuf<128> buf;
 6         TBool b = AknCommonDialogs::RunSelectDlgLD(buf, R_MEMORY_SELECTION_DIALOG);
 7         if ( b )
 8         {
 9             iAdvancedSettingData->iRingToneName.Copy(buf);
10             (*SettingItemArray())[aIndex]->LoadL();//aIndex==2
11             (*SettingItemArray())[aIndex]->UpdateListBoxTextL();//aIndex==2，修改text
12         }
13         return;
14     }
15 
16     CAknSettingItemList::EditItemL(aIndex, aCalledFromMenu);
17     ((*SettingItemArray())[aIndex])->StoreL();
18 }

感谢Nokia论坛的beover1984提供的帮助