Best way to size containers in Flex to obey ONLY parent containers' explicit dimensions

|------Container  ------------|
|  explicitHeight:  400 (or whatever)
|                             |
|  |-------- VBox  -------|   |
|  |  percentHeight: 100  |   |
|  |                      |   |
|  |  |-Repeater------|   |   |
|  |  | Potentially   |   |   |
|  |  | a lot of stuff.   |   |
|--|--|---------------|---|---|

public static function getFirstExplicitHeightInDisplayList(comp:UIComponent):Number{
    if (!isNaN(comp.explicitHeight)) return comp.explicitHeight;
    if (comp.parent is UIComponent) return
         getFirstExplicitHeightInDisplayList(UIComponent(comp.parent));
    else return 0;
}

clipContent = true;
verticalScrollPolicy = "off"

scrollRect = new Rectangle(x, y, w, h);