If I use the ArcGIS Runtime SDK for WPF Samples demo application to load a .bmp raster image that has WGS84 as the spatial reference - it does NOT display the raster image. If I take the same image and change the projection to WGS84 World Mercator Auxiliary or even NAD83 - it loads just fine. Why is this happening and how can I fix it? Is there any documentation on what is supported? It is just geographic projections that are not supported?