Does the Showcase work in IE7? 
http://gwt.google.com/samples/Showcase/Showcase.html#!CwDataGrid
If it does, then it's not an issue with "DataGrid in IE7", but how you're 
using it in your app.

(also, note that using RootLayoutPanel is not enough if you don't have 
RequiresResize/ProvidesResize widgets all the way down to your DataGrid: in 
the sample code you posted, you have a VerticalPanel which breaks the 
chain; but it's not the issue, as you explicitly set the width and height 
of the DockLayoutPanel).

I'm sorry I don't have time to download/build/test your sample project, and 
don't have an IE7 at hand either.

What I'd do:
 - try removing the DockLayoutPanel (setting explicit dimensions on the 
DataGrid instead)
 - set breakpoints within DataGrid (onResize, setSize and similar)
 - add logs (window.alert, GWT.log, or java.util.logging) of the DataGrid 
dimensions (and/or explore the DOM using the IE Developer Toolbar); beware 
that layout panels handle resize in a Scheduler#scheduleFinally, so defer 
your logging a bit; don't do it straight in your start() method.

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