I think you should take a look at the "VolumeFill" property of your volume page.
And you can't separately resize or relocate children of a volume page, so that's why your attempts are failing. You can only resize the volume page itself and/or set the CellSize property for its children. The volume won't resize automatically, btw, you'll have to do it yourself.
Also, if you implement the group window via a volume page, you can't (unless SOE recently changed it) use the same format that the default group window uses, you'll have to work with DynamicData instead.
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