Propertylist of Propertylist of page not showing properly

I have a page with Ilist property and the property has Ilist property in it. While displaying in CMS, it shows [object Object],[object Object] in grid. My code looks like below.

	[CultureSpecific]
        [Required]
        [EditorDescriptor(EditorDescriptorType = typeof(CollectionEditorDescriptor<MyPropType>))]
        [BackingType(typeof(MyPropTypeListProperty))]
        [Display(Name = "Something = 11)]
        public virtual IList<MyPropType> MyProps{ get; set; }
       [PropertyDefinitionTypePlugIn]
       public class MyPropTypeListProperty : PropertyListBase<MyPropType>
       {
       }
	public class MyPropType
	{
		[EditorDescriptor(EditorDescriptorType = typeof(CollectionEditorDescriptor<MySecondPropType>))]
      		  public virtual IList<MySecondPropType> MySecondProps{get;set;}
	}
	public class MySecondPropType
	{
	...
	}
 	[PropertyDefinitionTypePlugIn]
   	 public class MySecondPropTypeProperty : PropertyListBase<MySecondPropType>
    	{
   	}