I have a callback panel and can set Width and heigth to any pixel number just fine. However i can only set the Width to a Percentage of like 100 or 50 etc.. Height doesnt allow this and shrinks to like 0. I have a custom control inside this Callback panel and need the panel to be the rest of the Page without a scroll bar. I have tried setting everything thats is above it parent wise like body and form to 100% height to make sure it takes on the parents height. Still no go. Is there any way you know to accomplish the 100% hieght attribute ?