The buttons invoke the MoveTo... methods and the buttons themselves get enabled in accordance to the results of the CanMoveTo properties. They are registered as read-only dependencies properties, so that they cannot be modified through the public API. Their implementation relies on IPagedCollectionView.CanChangePage. However, making it always return true will not be enough as they also rely of IPagedCollectionView.PageIndex. For instance CanMoveToFirstPage is calculated like this:
return this.PageIndex > 0;
You can find the implementation of all the CanMoveTo... methods is our source code, in the DataPagerViewModel class.
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