Can't get new png to display using the GDI+ SDK

[goody11]

Hey,
I'm having some troubles reloading a new png in place of my old one on my window using the GDI+ SDK. Here is my WM_PAINT message:

case WM_PAINT:
		{
			BITMAP bm;
			PAINTSTRUCT ps;

//Painting the Background
			HDC hdc = BeginPaint(hwnd, &ps);

			HDC hdcMem = CreateCompatibleDC(hdc);
			HBITMAP hbmOld = (HBITMAP)SelectObject (hdcMem, g_hbmBackground);

			GetObject(g_hbmBackground, sizeof(bm), &bm);

			BitBlt(hdc, 0, 0, bm.bmWidth, bm.bmHeight, hdcMem, 0, 0, SRCCOPY);

			SelectObject(hdcMem, hbmOld);
			DeleteDC(hdcMem);

			OnPaint(hdc);
			EndPaint(hwnd, &ps);

		}

That mainly paints the background but the OnPaint function paints my pngs. Here's the OnPaint function:

VOID OnPaint(HDC hdc)
{	
   if (main_menu == 1)
   {
	   Graphics graphics(hdc);
	   Image image(L"Welcome.png");
	   graphics.DrawImage(&image, 0, 0);
   }
   
   if (main_menu == 2)
   {
	   Graphics graphics(hdc);
	   Image image(L"Master.png");
	   graphics.DrawImage(&image, 0, 0);
   }
}

Here's the section in the windows procedure that calls WM_PAINT:

ScreenToClient(hwnd,&p);
	ScreenToClient(hwnd,&p2);

	if(DetectLeftUpClickInRectangle(lParam,p.x,p.y,p2.x,p2.y) == TRUE)
	{
		main_menu = 2;
		InvalidateRect(hwnd,NULL, true);
	}

And lastly, here's the DetectLeftUpClickInRectangle function I made:

BOOLEAN DetectLeftUpClickInRectangle(LPARAM lParam, int ex1, int ey1, int ex2, int ey2)
{
    static int x1, y1, x2, y2;
    if(ex1 != -1)
    {
        x1 = ex1;
        y1 = ey1;
        x2 = ex2;
        y2 = ey2;
    }
    
    int mx, my; //x and y mouse coordinate variables
    mx = LOWORD(lParam);
    my = HIWORD(lParam);
    
    if( (mx >= x1 && mx <= x2) && (my <= y1 && my >= y2) )
        return TRUE;
    else
        return FALSE;
}

Also, main_menu is defaultly set to equal 1. All I get is the Welcome.png.
Any help?
Thank you.