Adding an empty dynamic layer makes my shapefiles display correctly - without it they are incorrect

Question

I have a completely empty dynamic layer

public class CustDynamicLayer2 : BaseDynamicLayer
{
public override void DrawDynamicLayer(esriDynamicDrawPhase DynamicDrawPhase, IDisplay iDisplay, IDynamicDisplay iDynamicDisplay) { }
}

I add a shape file with these four calls:

gcs = srFactory.CreateGeographicCoordinateSystem((int)esriSRGeoCSType.esriSRGeoCS_WGS1984);
mapControl.SpatialReference = gcs; 
mapControl.Map.AddLayer(new CustDynamicLayer2()); //without this my shapefile is badly distorted
mapControl.AddShapeFile(fileDir, fileName);

Basically if I don't add that empty class CustDynamicLayer2, the shapefile is distorted. This makes no sense to me because the class doesn't do anything.

Answer 1

The problem went away, now if I load the shapefile its distorted, but if I hit full extent it readjusts itself. So I think the drawing got interrupted or something.