Created Unassigned: AccordionItem height not refreshing when inner grid height changes [13128]

I am using Accordion control in silverlight 5, I am having grid inside the AccordionItem and at run time i am changing the grid height, but the AccordionItem height not refreshing according to this, if collpase and open it again the it gets fit to the desired height, is there any solution to this problem , i tried using UpdateLayout() and Measure funftions also at the size changed event of my inner DataGrid.

Please suggest any solution.