Thanks vincent and Mpete,
For now I can manage to put a side tab on the book by modifying the megazine.asul , below is my code for inserting side tab
<scrollpane anchors="25,75,pw-25,ph-75" clipchildren="false" id="pagecontainer" mousemode="mouse_move">
<box clipchildren="false" height="pageh" name="$viewport$" width="pagew*2">
<box background="image(src/en/tab.swf)" height="545" mouseenabled="true" width="28.6" x="(pagew*2)-0" y="10"/>
</box>
</scrollpane>
On the code above I just only insert the box element with the tab.swf as my flash file use as tab , you need to set mouseenabled=true so that you can click your tab, the advantage of having this box inside the scrollpane element is that
it stick on the book even you resize the page or zoom.
For this tab, no need to recompile the megazine flash file, you just add you tab flash file and have the button code below to navigate to the book pages
this.addEventListener(MouseEvent.CLICK, gotopage);
function gotopage(event:MouseEvent):void
{
var url:URLRequest = new URLRequest("#/10");
navigateToURL(url, "_self");
}
The #/10 is the page you want the book to go when clicking the button on the tab.
You can view the preview of the book with side tab here
http://www.mindworksoft.com/book/