Use the RenderDisabledButtonsAsLabels property to specify whether disabled buttons are rendered as Label controls by the NextPreviousPagerField object. The buttons are disabled by the NextPreviousPagerField object when the function associated with the button cannot be performed. For example, when you are in the first page of data, the first-page and previous-page buttons are disabled.
By default, the NextPreviousPagerField object renders the disabled buttons by using the control type specified by the ButtonType property. It also sets the Enabled property of the control to false.