RE: [flexcoders] Custom UIComponent creating problem

[Gordon Smith]

A general rule in Flex layout management is that children get positioned and sized by their parents. I suspect that the reason you don't see anything is that item_button has a width and height of 0 by default.   If you extend UIComponent, then it is your responsibility to position and size all of your component's children (in this case, item_button) in an override of updateDisplayList().   When you extend HBox, HBox's override of updateDisplayList() implements the horizontal box layout algorithm for the children.   - Gordon   From: flexcoders@yahoogroups.com [mailto:flexcoders@yahoogroups.com] On Behalf Of sinacapho Sent: Tuesday, August 15, 2006 1:18 AM To: flexcoders@yahoogroups.com Subject: [flexcoders] Custom UIComponent creating problem   Dear all, i have the followig problem , i have using AS3 to created a custom component (extends from UIComponent) , i find that the custom component cannot display on the screen. But if the component extends from HBox , it will show correctly . Can someone tell me why? The code is attached. thx capho // Mxml <?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" xmlns:gp="test_comp.*"> <mx:Panel width="100%" height="100%"> <gp:test_item/> </mx:Panel> </mx:Application> // ActionScript file package test_comp{ import mx.core.UIComponent; import mx.controls.Button; import mx.containers.HBox; public class test_item extends HBox{ private var item_button:Button; public function test_item(){ super(); } override protected function createChildren():void { super.createChildren(); if (!item_button){ item_button = new Button(); item_button.label = "As"; addChild(item_button); } } override protected function measure():void{ super.measure(); measuredWidth = measuredMinWidth = 410; measuredHeight = measuredMinHeight = 30; } } } __._,_.___ -- Flexcoders Mailing List FAQ: http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt Search Archives: http://www.mail-archive.com/flexcoders%40yahoogroups.com YAHOO! GROUPS LINKS  Visit your group "flexcoders" on the web.    To unsubscribe from this group, send an email to:  [EMAIL PROTECTED]    Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. __,_._,___