Scroller not shown Flex 4 with VGroup - actionscript-3

Question

I am creating one application. In that There is one popup, in that I had used one VGroup in one Scroller.
I am dynamically adding my custom components in VGroup and removing all components at the closing of the popup and saves those components in Memory Pool.
In First step, I open a popup with numbers of components by that scroll bar appears.
Then I close the popup.
In second step, I opens a same popup instance with some less components so scroll bar does not appears and close the popup.
And now when I open popup with more components again scrollbar not appears.
So whenever popup is once opend with less components, scrollbar disappears.
Pls help me...
Here is the full code :
<s:Scroller id="myScroller"
width="100%"
height="210"
horizontalScrollPolicy="off">
<s:VGroup id="myContainer"
width="100%"
height="210" />
</s:Scroller>
Code for Adding Components :
for each(var object:MyObject in _arr)
{
var newView:MyCustomView = MyCustomViewPool.acquire();
myContainer.addElementAt(newView, 0);
newView.myData = object;
}
Here is the code for removing components :
for(var i:int = 0; i < myContainer.numElements; i++)
{
var newViewElement:IVisualElement = myContainer.getElementAt(i);
var myViewComponent:MyCustomView = newViewElement as MyCustomView;
MyCustomViewPool.release(myViewComponent);
}
myContainer.removeAllElements();

Answer 1

I think you don't have to set the hight on the VGroup. Just remove the assignment.