Select the 10th line and then scrolls to that line when you click the button

            

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<!-- sparktextcontrols/SelectScrollableRET.mxml -->
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
    xmlns:mx="library://ns.adobe.com/flex/mx"
    xmlns:s="library://ns.adobe.com/flex/spark">
    <s:layout>
        <s:VerticalLayout />
    </s:layout>
    <fx:Script>
         
        private function scrollToLine():void { 
            myRET.selectRange(440, 471); 
            myRET.scrollToRange(440, 471); 
        } 
      
    </fx:Script>
    <s:Scroller>
        <s:RichEditableText id="myRET"
            selectionHighlighting="TextSelectionHighlighting.ALWAYS"
            selectable="true" height="100" width="200">
            <s:text>
                This text scrolls vertically1! This text scrolls vertically2!
                This text scrolls vertically3! This text scrolls vertically4!
                This text scrolls vertically5! This text scrolls vertically6!
                This text scrolls vertically7! This text scrolls vertically8!
                This text scrolls vertically9! This text scrolls vertically10!
                This text scrolls vertically11! This text scrolls vertically12!
                This text scrolls vertically13! This text scrolls vertically14!
            </s:text>
        </s:RichEditableText>
    </s:Scroller>
    <s:Button label="Select and Scroll to Line 10" click="scrollToLine()" />
</s:Application>

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Select the 10th line and then scrolls to that line when you click the button : Text « Components « Flex

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