DefaultButton: the default button in a Panel. The default button is invoked when you press the Enter button.
Direction: direction in which controls that display text are rendered.
Possible values are NotSet, LeftToRight, and RightToLeft.
GroupingText: render the Panel control as a fieldset with a particular legend.
HorizontalAlign: horizontal alignment of the contents of the Panel.
Possible values are Center, Justify, Left, NotSet, and Right.
ScrollBars: display scrollbars around the panel's contents.
Possible values are Auto, Both, Horizontal, None, and Vertical.
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Panel Grouping Text