Flex viewstack Height

Hello All,
I have a Viewstack with three pages.
for the first page, view stack height  is 600(its a constant height).
for the second page ,view stack height  is 650(its also constant height).
for the third page , view stack height is adjusted as the height of the third page is calculated(the height of the page is dyanmic and that height is assigned to viewstack).
the problem when i come back to the first the view stack height is not reflecting to 600.it is taking the height of the third page.
i am using the propery resizeToContent="true". for the view stack but it is not adjustiing.
How can i do ths. could some body help me.
Thanks .
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Try this :
for the first page set maxHeight = 600
then when u come from the third page to first page
check the viewstack height with maxheight if is not equal then set the height to maxHeight...Something like this:
private function setCatalogHeight():void
                        if (vsMainViews.height != vsMainViews.maxHeight)
                              vsMainViews.height = vsMainViews.maxHeight;
                              this.verticalScrollPolicy = "auto";
Call the above function when your viewstack's selected index changes

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