Using how do I customize my splitLayoutPanel slider bars with buttons?

I am using the splitLayoutPanel in my widget design. I have two slider
bars from the splitLayoutPanel, one vertical and one horizontal. I
want to modify the horizontal bar by adding the following buttons:

"UP" causes the slider bar to jump to the maximum top are of the
window, so you don't have to slide it. "DOWN" Opposite of "UP". "New
Note" Create a new note which will appear in the bottom half of the
horizontally split area.

So I need to make the horizontal split bar wide enough for the buttons
and I need to add the bottons onto it. How do I go about doing this?

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