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    <p>You could also augment the extension method approach to incorporate state, in a pattern not unlike WPF's attached properties. </p> <p>Here is an example with minimum boilerplate. Note that no modification are required on the target classes, including adding interfaces, unless you need to deal with the target class polymorphically - in which case you end up with something very close to actual Multiple Inheritance.</p> <pre><code>// Mixin class: mixin infrastructure and mixin component definitions public static class Mixin { // ===================================== // ComponentFoo: Sample mixin component // ===================================== // ComponentFooState: ComponentFoo contents class ComponentFooState { public ComponentFooState() { // initialize as you like this.Name = "default name"; } public string Name { get; set; } } // ComponentFoo methods // if you like, replace T with some interface // implemented by your target class(es) public static void SetName&lt;T&gt;(this T obj, string name) { var state = GetState(component_foo_states, obj); // do something with "obj" and "state" // for example: state.Name = name + " the " + obj.GetType(); } public static string GetName&lt;T&gt;(this T obj) { var state = GetState(component_foo_states, obj); return state.Name; } // ===================================== // boilerplate // ===================================== // instances of ComponentFoo's state container class, // indexed by target object static readonly Dictionary&lt;object, ComponentFooState&gt; component_foo_states = new Dictionary&lt;object, ComponentFooState&gt;(); // get a target class object's associated state // note lazy instantiation static TState GetState&lt;TState&gt;(Dictionary&lt;object, TState&gt; dict, object obj) where TState : new() { TState ret; if(!dict.TryGet(obj, out ret)) dict[obj] = ret = new TState(); return ret; } } </code></pre> <p>Usage:</p> <pre><code>var some_obj = new SomeClass(); some_obj.SetName("Johny"); Console.WriteLine(some_obj.GetName()); // "Johny the SomeClass" </code></pre> <p>Note that it also works with null instances, since extension methods naturally do.</p> <p>You might also consider using a WeakDictionary implementation to avoid memory leaks caused by the collection's holding on to target class references as keys.</p>
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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