Moves the cursor-end of the current selection with the next Navigation Command, extending or shrinking the selection accordingly. For example, if the cursor-end of the selection is last and a Down command is preceded by ContinueSelection, the cursor will move down and the selection will be extended down one line to the cursor's position. However, if the cursor-end of the selection is first (at the beginning of the selection) and a Down command is preceded by ContinueSelection, the cursor will move down and the selection will shrink by one line to the cursor's position.