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    <blockquote> <p>I am building a graphic component in MXML that has different states, each state having its own size.</p> </blockquote> <p>You have a misunderstanding of how the Flex Component Architecture works. A component never sizes itself. It is always up to the parent to size it's children. You can override the measure method to set measuredWidth and measuredHeight; however these are only suggestions provided to the component's parent. It is up the component to decide whether to accept them or no.</p> <p>So, in your example, you can change the height/width of the button (a child); but you cannot change the height/width of the canvas (The component you're extending) and expect it to stick.</p> <p>Without seeing the code that contains this canvas component, it's hard to say for sure what is going on. But, in this case, you should override the measure method to change the measuredWidth / measuredHeight. Something like this:</p> <pre><code>override protected measure():void{ if(currentState=='Normal'){ measuredWidth = 0; measuredHeight = 0; } else { measuredWidth = button.width; measuredHeight = button.height; } } </code></pre> <p>When the state changes, be sure to call the invalidateSize() method. You can do this by listening to the <a href="http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/mx/core/UIComponent.html#event%3acurrentStateChange" rel="nofollow">currentStateChange</a> event.</p> <p>In theory, that will cause the component to change the measuredWidth/measuredHeight; which will force the parent to also redraw itself, accommodating for the new measuredWidth/measuredHeight. </p> <p>MXML masks a lot of these details.</p>
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    1. COThanks for these advises. As I said as a comment to my question, I solved my problem by using the rollOver/rollOut events. The difference between mouseOver and rollOver being that the former considers mouseOver subcomponent of the specified component while the later considers the component itself.
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A row detail

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.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

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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