Is this a bug? come in to see the code please

Question

I am using Flex Builder 3 code name "Moxie".
The basic idea is having a linkedbutton on a panel, then if
you click on the linkedbutton, both the linkedbutton and the panel
underneath catch the mouse click event. Is this a bug? I am
expecting only the linkedbutton is able to capture the mouse click
event. Or is there anything wrong with the codes? Thanks in advance
for help.
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="
http://www.adobe.com/2006/mxml"
layout="absolute" >
<mx:Script>
<![CDATA[
import mx.controls.Alert;
public function dpMouseDown(e:MouseEvent):void
Alert.show("Mouse caught by PANEL");
public function lkMouseDown(e:MouseEvent):void
Alert.show("Mouse caught by LINKBUTTON");
]]>
</mx:Script>
<mx:Panel id="dPanel"
height="100%" width="100%"
borderStyle="none"
backgroundColor="cyan"
horizontalScrollPolicy = "off"
verticalScrollPolicy = "off"
click="dpMouseDown(event)"
>
<mx:LinkButton id="linkButton"
label="HHHHHHHHHHHHHHHHHHHHHHHH"
width="200" height="200" x="100" y="100"
click="lkMouseDown(event)"/>
</mx:Panel>
</mx:Application>

Answer 1

no its not a bug its the "bubbling" feature ( use the search
to get more infos about the event handling)...
If you replace the code in the function, you can stop the
bubbling:
public function lkMouseDown(e:MouseEvent):void
Alert.show("Mouse caught by LINKBUTTON");
e.stopImmediatePropagation();
best regards,
kcell