How to control the scroll bar of a ContentPanel with the UP and DOWN key of keyboard

How to control the scroll bar of a ContentPanel with the UP and DOWN key of keyboard?

I want to control the scroll bar of a ContentPanel with the UP and DOWN key of keyboard as the grid.

In my Project, there are some blank grids with horizontal scroll bar on some page, when I focus the blank grid and press the UP or DOWN key, the key could control the scroll bar.

But, I try the same handling on the ContentPanel, does not fire the OnScroll event for the panel.

I try to find the reason from the grid handling, but no clue.

Please help me if anyone can.

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