Method TBrowse():pageUp() Foundation
Scrolls one page up.
:pageUp() --> self:pageUp() returns a reference to the TBrowse object.
The method :pageUp() moves the record pointer backward the number of data records which are visible in the browse window, and invalidates the browse display. If the first data record is already visible in the browse window, the browse cursor is merely positioned to the first data row. When the browse cursor is already on the first data row and the record pointer also stands on the first record, the browse window is unchanged and the TBrowse object assigns .T. (true) to its instance variable :hitTop.
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