Please accept my apologies for the late reply.
You can try to handle SizeChanged event of the pager
and based on its width, to decide what NumericButtonCount should be. For example:
private void OnPagerSizeChanged(object sender, SizeChangedEventArgs e)
var pager = sender as RadDataPager;
pager.NumericButtonCount = e.NewSize.Width > 400 ? 6 : 2;
Will that approach meet your requirements ?
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