Grids do not properly allow users to set a selection via keyboard

[jeroens]

Commonly, the keyboard interface to make a selection in a Grid in Windows is as follows:

• Move the focus to different cells with the arrow keys
• Select cells by press and holding the [Shift] key. The cell that the [Shift] key was first pressed becomes the first anchor point of the new selection; the current position of the focus becomes the second anchor point of the new selection. Whenever the cell focus moves, the rectangular range from first to second anchor is selected
• Behaviour of the [Ctrl] key is not standardized among applications

In EwE6, navigating a grid with the keyboard and [Shift] and/or [Ctrl] only selects the new focus cell, not the range between cells