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https://issues.apache.org/jira/browse/FLEX-13978?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Justin Mclean resolved FLEX-13978.
----------------------------------

    Resolution: Cannot Reproduce

Fixed in earlier version of the SDK.
                
> Cannot reduce six pixels left and right gaps in MX HSlider component
> --------------------------------------------------------------------
>
>                 Key: FLEX-13978
>                 URL: https://issues.apache.org/jira/browse/FLEX-13978
>             Project: Apache Flex
>          Issue Type: Bug
>          Components: mx: Slider
>    Affects Versions: Adobe Flex SDK 3.0 (Release)
>         Environment: Affected OS(s): All OS Platforms
> Language Found: English
>            Reporter: Adobe JIRA
>
> Steps to reproduce:
> <?xml version="1.0" encoding="utf-8"?>
> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"; paddingLeft="10" 
> paddingRight="10">
>       <mx:HBox width="100%" backgroundColor="#ff0000">
>               <mx:HSlider width="100%"/>
>       </mx:HBox>
> </mx:Application>
>  
>  Actual Results:
>  
> See Attachments
>  
>  Expected Results:
>  
> Must be no gap on the end width is 100% 
>  Workaround (if any):
>  
> Not with current implementation. I think problem on calculation 
> trackLeftOffset variable in mx.controls.sliderClasses.Slider class.
> May be better to declare widestThumb value into CSS component style.
> override protected function updateDisplayList(unscaledWidth:Number,
>                                                   unscaledHeight:Number):void
>     {
>         super.updateDisplayList(unscaledWidth, unscaledHeight);
>         var isHorizontal:Boolean = (_direction == SliderDirection.HORIZONTAL);
>         var numLabels:int = labelObjects ? labelObjects.numChildren : 0;
>         var numThumbs:int = thumbs ? thumbs.numChildren : 0;
>         var trackMargin:Number = getStyle("trackMargin");
>         var widestThumb:Number = 6;
>         var trackLeftOffset:Number = widestThumb / 2; // Enough space for the 
> thumb to rest at the edges

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