Scroll are not coming while using DockLayoutPanel

Hi everyone,
I got the following lines of code here:

DockLayoutPanel doc = new DockLayoutPanel(Unit.PX);
....
//some code goes here to add widgets to doc
....

RootLayoutPanel.get().add(doc);

Now the size of docklayoutpanel here exeeds client window height but I
am not getting any scroll bars here on browser. I see css property
'overflow: hidden' could be a problem but taking out all 'overflow:
hidden' makes it more ugly.
I hope there would be a better solution to handle this problem

Thanks in advance

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