Q: Detecting when a Node is Detatched from the Scene Graph, How?

Hi All,
My nodes are regiserted observers with an Async service. I need to know when a nodes is detached/removed from the Scene graph so that I can remove it from the Async service.
The only thing I can think of at the moment is to bind to Node.scene but I would like to think there is a more "standardized" way of doing this (I don't want to re-invent the wheel).
Example (improved from 1st post):
class MyCustomNode extends CustomNode {
        var sceneMonitor:Scene = bind scene on replace {onSceneChange()};       
        public var onSceneChange:function():Void = function():Void{
                if (scene == null){
                    println("we have no scene");
                } else {
                    println("we have a scene");
}Edited by: AndrewHughes on Oct 12, 2009 6:13 AM

You can add an "initialized" flag into your CustomNode and set it true in the postinit block
var initialized = false;
postinit { initialized = true }The parent and scene of the node won't be set until after the CustomNode is past the postinit phase. You can use this flag to determine whether or not the change in parent or scene is because the node is being added, or because the node is being removed.
var fubar = bind scene on replace {
    if (initialized and scene == null) {
        // cleanup
}You could also use the old value and the new value in the on replace:
var fubar = bind scene on replace oldscene = newscene {
    if (oldscene != null and newscene == null) {
        // cleanup
}

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    イベント ID:       1000
    タスクのカテゴリ:      (100)
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    WATSON_STAGEONE_URL:  http://watson.microsoft.com/StageOne/MSACCESS_EXE/15_0_4420_1017/50674523/unknown/0_0_0_0/bbbbbbb4/80000003/00000000.htm?Retriage=1
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    SWORD                      
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    PTR                 <unknown type>
    SQLLEN                     4
    SQLLEN *            0x00000000002C1E38
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    HSTMT               0x0000000009F7C490
    UWORD                      
    10 
    SWORD                      
    99 <SQL_C_DEFAULT>
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    HSTMT               0x0000000009F7C490
    Test            1174-10f0
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    HSTMT               0x0000000009F7C490
    Test            1174-10f0
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    UWORD                      
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    HSTMT               0x0000000009F7C490
    UWORD                      
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