Basic menubar

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i quite new flex , have been unable wrap myself around menubars. looking @ basic design in developer's guide , structure seems straight forward. question how state change when 1 of menuitems clicked?

<mx:menubar id="mymenubar" labelfield="@label">
<mx:xmllist>
<menuitem label="menuitem a" >
<menuitem label="submenuitem a-1" enabled="false"/>
<menuitem label="submenuitem a-2"/>
</menuitem>
<menuitem label="menuitem b" type="check" selected="true"/>
<menuitem label="menuitem c" type="check" selected="false"/>
<menuitem label="menuitem d" >
<menuitem label="submenuitem d-1" type="radio" groupname="one"/>
<menuitem label="submenuitem d-2" type="radio" groupname="one"
selected="true"/>
<menuitem label="submenuitem d-3" type="radio" groupname="one"/>
</menuitem>
</mx:xmllist>
</mx:menubar>

so in above example if user clicked on submenu a-1 how change state statea1? tried adding onclick event , didn't seem work.

read post on menubar. can modify change states instead of view stack.

http://www.adobe.com/cfusion/webforums/forum/messageview.cfm?forumid=60&catid=585&threadid =1266536&highlight_key=y


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