Adjusting height of GWT Panels based on content dynamically

We have many screens where different types of GWT panels are used. One
common problem across many screens is that, content size is derived at
runtime. So, if I define a height for a panel(Vertical/Horizontal/
DockPanel) and when any new components are getting added within panel
or content is more, panel height remains the same. So we are not able
to see the contents. UI look and feel becomes worst. How do we handle
the height problems? Do we have to manually code to adjust every panel/
widget height when something gets changed in screen. Is it not a very
bad way of coding?
Also, now we have datagrids at some places, if no of records are very
less, we see a huge space left out below datagrid, not sure how do we
handle these cases?

Somebody please suggest as it is quite urgent.

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