public extern static bool ImageList_SetOverlayImage(IntPtr himl, int iImage, int iOverlay);

      if (!NativeMethods.ImageList_SetOverlayImage(imageList.Handle, imageIndex, overlayIndex))

        NativeMethods.ImageList_SetOverlayImage(((ImageList)sender).Handle, vals[i], i + 1);

static extern bool ImageList_SetOverlayImage(IntPtr hImageList, int iImage, int iOverlay);

Private Shared Function ImageList_SetOverlayImage(hImageList As IntPtr, iImage As Integer, iOverlay As Integer) As Boolean

       public extern static bool ImageList_SetOverlayImage(IntPtr himl, int iImage, int iOverlay);

      if (!NativeMethods.ImageList_SetOverlayImage(imageList.Handle, imageIndex, overlayIndex))

        NativeMethods.ImageList_SetOverlayImage(((ImageList)sender).Handle, vals[i], i + 1);