c语言 对话框窗体 初始化WM_INITDIALOG 不能出图？？怎么处理？？？

#define MANIFEST 24
#define DLG_MAIN 100
#define DLG_MAIN1 101
#define IDC_IMG1 102
#define IDC_IMG2 103
#define IDC_BTN1 104
#define IDB_BITMAP1 200
#define IDB_BITMAP2 201


#include <windows.h>
#include <commctrl.h>
#include "resource.h"

LANGUAGE 0,0

DLG_MAIN DIALOGEX 0,0,420,225
CAPTION "Dialog"
FONT 8,"Ms Shell Dlg",0,0,0
STYLE WS_POPUP|WS_VISIBLE|WS_CAPTION|WS_SYSMENU|DS_CENTER|DS_MODALFRAME|DS_SHELLFONT|DS_3DLOOK
BEGIN
  CONTROL "",IDC_IMG1,"Static",WS_CHILDWINDOW|WS_VISIBLE|SS_SUNKEN|SS_CENTERIMAGE|SS_BITMAP,10,20,285,175
  CONTROL "IDC_BTN",IDC_BTN1,"Button",WS_CHILDWINDOW|WS_VISIBLE|WS_TABSTOP,325,40,65,30
END

1 MANIFEST "./manifest.xml"

IDB_BITMAP1 BITMAP DISCARDABLE "./111.bmp"
IDB_BITMAP2 BITMAP DISCARDABLE "./222.bmp"

DLG_MAIN1 DIALOGEX 10,10,435,230
CAPTION "IDD_DLG"
FONT 8,"MS Sans Serif",0,0,0
STYLE WS_VISIBLE|WS_CAPTION|WS_SYSMENU|WS_MINIMIZEBOX|DS_CENTER
BEGIN
  CONTROL "",IDC_IMG2,"Static",WS_CHILDWINDOW|WS_VISIBLE|SS_SUNKEN|SS_CENTERIMAGE|SS_BITMAP,10,10,355,205
END

#include <windows.h>
#include <commctrl.h>
#include "resource.h"

HINSTANCE hInst;

BOOL CALLBACK DlgMain1(HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    switch(uMsg)
    {
    case WM_INITDIALOG:
    {
        HBITMAP himg=LoadBitmap(hInst, MAKEINTRESOURCE(IDB_BITMAP2));
        HBITMAP oldimage=(HBITMAP)SendMessage(GetDlgItem(hwndDlg, IDC_IMG2),STM_SETIMAGE,IMAGE_BITMAP,(LPARAM)himg);
        if(oldimage != NULL)
        {
            DeleteObject(oldimage);
        }
        DeleteObject(himg);
    }
    return TRUE;

    case WM_CLOSE:
    {
        EndDialog(hwndDlg, 0);
    }
    return TRUE;

    case WM_COMMAND:
    {
        switch(LOWORD(wParam))
        {
        }
    }
    return TRUE;
    }
    return FALSE;
}

BOOL CALLBACK DlgMain(HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    switch(uMsg)
    {
    case WM_INITDIALOG:
    {
        HBITMAP himg=LoadBitmap(hInst, MAKEINTRESOURCE(IDB_BITMAP1));
        HBITMAP oldimage=(HBITMAP)SendMessage(GetDlgItem(hwndDlg, IDC_IMG1),STM_SETIMAGE,IMAGE_BITMAP,(LPARAM)himg);
        if(oldimage != NULL)
        {
            DeleteObject(oldimage);
        }
        DeleteObject(himg);
    }
    return TRUE;

    case WM_CLOSE:
    {
        EndDialog(hwndDlg, 0);
    }
    return TRUE;

    case WM_COMMAND:
    {
        switch(LOWORD(wParam))
        {
        case IDC_BTN1:

            DialogBox(hInst, MAKEINTRESOURCE(DLG_MAIN1), NULL, (DLGPROC)DlgMain1);
            break;
        }
    }
    return TRUE;
    }
    return FALSE;
}


int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd)
{
    hInst=hInstance;
    InitCommonControls();
    return DialogBox(hInst, MAKEINTRESOURCE(DLG_MAIN), NULL, (DLGPROC)DlgMain);
}