bitmap disapears

anyone know why a bitmap disapears when the app is minimized

hdc = GetDC(hwnd)
HBITMAP hbitmap = (HBITMAP)LoadImage(hInstance,"pic.bmp",IMAGE_BITMA P,0,0,LR_LOADFROMFILE);
HDC hbmp = CreateCompatibleDC(hdc);
HBITMAP old_hbitmap = (HBITMAP)SelectObject(hbmp,hbitmap);
BitBlt(hdc,x,y,20,20,hbmp,0,0,SRCCOPY);

yes, because it is not windows job to redraw it when you restore the window. It will tell you when it's appropriate to redraw with a WM_PAINT message though.