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    <p>What you really need in this case is not some way to automatically detach but to ensure that the reference held by the long lived object does not keep the behaviour (and therefore everything else it has a reference to) from being garbage collected.</p> <p>This is acheived by implementing a Mediator pattern. The concept is that you don't give the long-lived object a delegate with a reference to your <code>Behaviour</code>, instead you create a Mediator class as a go-between. The mediator attaches to the long-lived objects event and holds a <a href="http://msdn.microsoft.com/en-us/library/system.weakreference(v=VS.95).aspx" rel="nofollow noreferrer">WeakReference</a> to the behaviour. When the long-lived object fires the event the mediator checks that the <code>WeakReference</code> is still alive, if so calls a method on it to pass on the event. If when the event occurs the mediator finds that the <code>WeakReference</code> is no longer alive it detaches its event handler from the long lived object.</p> <p>Hence there is nothing stopping the behaviour and everything else involved from being garbage collected all thats left is a very small mediator instance with a dead reference still attached to the long-lived object. Since these mediators are tiny they don't represent a real problem and even those will disappear the next time the event fires.</p> <p>Fortunately you don't have to build this stuff yourself others have already done it. It is called the <code>WeakEventListener</code>. This blog: <a href="http://blogs.msdn.com/delay/archive/2010/02/25/highlighting-a-weak-contribution-enhancements-make-preventing-memory-leaks-with-weakeventlistener-even-easier.aspx" rel="nofollow noreferrer">Highlighting a "weak" contribution; Enhancements make preventing memory leaks with WeakEventListener even easier!</a> has an excellent set of links on the subject.</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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Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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