Layers are saved and loaded as TIFF images with Wang annotations (not all layer types are supported)
Note: ◼Has no effect unless the TIEDBBitmap is specified as the external bitmap for a TImageEnView. ◼If this property is not ielmDisabled, it will override the value set for TIEDBBitmap.ImageFormat (with either ioIEN, ioPSD, ioJPEG, ioTIFF) ◼If you call SetExternalBitmap after setting LayerMode, you will need to reload the image to see the layers