What is RelatedImageListAttribute?

One use of RelatedImageListAttribute is to tell ImageIndexEditor where to get the images.

Imagine a class called ClassA with a property called ImageKey, and another property called PropertyB, which is a structure with an ImageList property.

Then, this is how ImageKey should be described:

[Editor("System.Windows.Forms.Design.ImageIndexEditor, System.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a", typeof(UITypeEditor))] [RefreshProperties(RefreshProperties.Repaint)] [RelatedImageList("PropertyB.ImageList")] [TypeConverterAttribute(typeof(ImageKeyConverter))] public string ImageKey { set; get; }