[flexcoders] How to create Viewstack Programmatically.

[Swamy Nathan]

Hi Folks,

 First i am create the empty view stack to the application

<mx:ViewStack id="Props" width="920" visible="true" bottom="10" height="134"
x="10">

            </mx:ViewStack>   *

and then i am reading the xml and create the canvas inside controls and then
i add the canvas to the Props viewstack

Props.addchild(prpcanvas); and also am using the
Props.addchildAt(prpcanvas);

but its work for the first time, and the next time will add the another
canvas its return an error

RangeError: Error #2006: The supplied index is out of bounds.
    at flash.display::DisplayObjectContainer/getChildAt()
    at
mx.core::Container/getChildAt()[E:\dev\3.0.x\frameworks\projects\framework\src\mx\core\Container.as:2332]
    at mx.core::Container/
http://www.adobe.com/2006/flex/mx/internal::getScrollableRect()[E:\dev\3.0.x\frameworks\projects\framework\src\mx\core\Container.as:4201]
    at
mx.core::Container/createContentPaneAndScrollbarsIfNeeded()[E:\dev\3.0.x\frameworks\projects\framework\src\mx\core\Container.as:4161]
    at
mx.core::Container/validateDisplayList()[E:\dev\3.0.x\frameworks\projects\framework\src\mx\core\Container.as:2689]
    at
mx.managers::LayoutManager/validateDisplayList()[E:\dev\3.0.x\frameworks\projects\framework\src\mx\managers\LayoutManager.as:602]
    at
mx.managers::LayoutManager/doPhasedInstantiation()[E:\dev\3.0.x\frameworks\projects\framework\src\mx\managers\LayoutManager.as:675]
    at Function/http://adobe.com/AS3/2006/builtin::apply()
    at
mx.core::UIComponent/callLaterDispatcher2()[E:\dev\3.0.x\frameworks\projects\framework\src\mx\core\UIComponent.as:8460]
    at
mx.core::UIComponent/callLaterDispatcher()[E:\dev\3.0.x\frameworks\projects\framework\src\mx\core\UIComponent.as:8403]
    at flash.events::EventDispatcher/dispatchEventFunction()
    at flash.events::EventDispatcher/dispatchEvent()
    at
mx.core::UIComponent/dispatchEvent()[E:\dev\3.0.x\frameworks\projects\framework\src\mx\core\UIComponent.as:9051]
    at
mx.managers.dragClasses::DragProxy/mouseUpHandler()[E:\dev\3.0.x\frameworks\projects\framework\src\mx\managers\dragClasses\DragProxy.as:500]

how can i rectify this problem.... How to create a viewstack
programmatically.

Please Reply me...
*

-- 
Thanks & Regards
Swaminathan. M