calculate the height of parent element

I have three datagrids inside VBo开发者_StackOverflow中文版x container. Since I don't want scrollbar in my flex widget i am increasing the height of SWF through javascript, which increases with each addition of row in my datagrid. My query is how can I get the exact height of my VBox which is the parent element of datagrid. I am not able to get the height of VBox. I have tried to use measuredHeight,height with no success. Could anybody please suggest me the way out for the same.

Thanks in advance!!!

---

vbox.height should give you theheight of the DataGrid.