Question

Using actionscript 3, can someone give an example how I can dynamically change the submenu items below?

<fx:Declarations>
<fx:XMLList id="menuData" xmlns="">
    <menuitem label="Column A">
            <menuitem label="Item A.1"/>
            <menuitem label="Item A.2"/>
    </menuitem>
    <menuitem label="Column B">
            <menuitem id="ItemB1" label="B.1"/>
            <menuitem type="separator"/>
            <menuitem label="Item B.2" type="check"/>
            <menuitem label="Item B.3" type="check"/>
            <menuitem id="myId" label="Item B.4">
                <menuitem label="SubItem B.4.1"/>
                <menuitem label="SubItem B.4.2"/>
            </menuitem>
    </menuitem>
        ...
</fx:XMLList>
<fx:Declarations>
...
<mx:MenuBar dataProvider="{menuData}" .../>

For example, suppose we want to replace submenu items B.4.1 and B.4.2 with:

<menuitem label="SubItem abc"/>
<menuitem label="SubItem def"/>
<menuitem label="SubItem ghi"/>

Answer 1

Grab the item by its label, or better, give it an id and use this to retreive it, and then replace its children.

You can easily do this utilizing E4X:

var item:XMLList = menuData..menuitem.(attribute('label') == "Item B.4");

var subItems:XML = 
    <items>
        <menuitem label="SubItem abc"/>
        <menuitem label="SubItem def"/>
        <menuitem label="SubItem ghi"/>
    </items>;

item.setChildren(subItems.menuitem);

See http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/XML.html for more information on this subject.