If I change drop down behavior for instance for images to CreateContentBlock how do I code view to render this content block?

To be more precise suppose image drop to property of type XhtmlString called MainBody.

[UIDescriptorRegistration]
public class ImageFileUIDescriptor : UIDescriptor, IEditorDropBehavior
{
    public ImageFileUIDescriptor() : base(ContentTypeCssClassNames.Image)
    {
        DefaultView = CmsViewNames.AllPropertiesView;
        EditorDropBehaviour = EditorDropBehavior.CreateContentBlock;
    }

    public EditorDropBehavior EditorDropBehaviour { get; set; }
}