I apologise if my question was unclear,
Setting 100% height for controls does not stretch them in browser.
If you set 100% height of control , browser does not render it in full mode.
Here is sample with reportviewer control.
I am trying to avoid double vertical scroll bars on my pages.
If i set fixed height for some control, users with higher resolution will have gap between footer and bottom of control, on other way if I set higher height for control, users whit smaler resolution wll have double scrol bars on that page, one set by page other set by control itself.