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  1. PO
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    <p>I recommend you to solve the problem on a ExpandCollapseMenu container level. When ExpandCollapseMenu's state is changed you should iterate over children and set some flag for each of them.</p> <p>So I suggest to introduce expanded:Boolean flag for ExpandCollapseMenuButton.</p> <p>The problem occurs if ExpandCollapseMenu can contain other instance's types. In this case we can solve it using the following two ways:</p> <ol> <li>Check components in process of iterating if they are ExpandCollapseMenuButton instances (using is operator).</li> <li><p>Introduce simple Expandable interface like the following:</p> <pre><code>public interface Expandable { function set expanded(value:Boolean); } </code></pre></li> </ol> <p>and implement this interface by ExpandCollapseMenuButton. So you can use is operator in iterator body more flexible way without ExpandCollapseMenuButton dependency.</p> <p>So the last part of puzzle is to implement setter in ExpandCollapseMenuButton class and switch skin:</p> <pre><code>private var expandedDirty:Boolean; private var _expanded:Boolean; public function set expanded(value:Boolean) { if (value == _expanded) return; _expanded = value; expandedDirty = true; invalidateProperties(); } override protected function commitProperties():void { super.commitProperties(); if (expandedDirty) { if (_expanded) setStyle("skinClass", ExpandCollapseMenuButtonExpandedSkin); else setStyle("skinClass", ExpandCollapseMenuButtonSkin); expandedDirty = false; } } </code></pre>
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    1. POFlex 4 Skin: Change skin based on parent containers state
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    1. USConstantiner
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    1. COThanks Constantiner. Yes, there will be other instances than just ExpandCollapseMenuButtons, like toggle buttons, buttongroups, sliders etc. But as you say, this can be solved in some generic way, e.g. interface.
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