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Add FocusablePanel doc

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Steve Streeting 2020-10-27 11:47:51 +00:00
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# FocusablePanel
You can use this as a base class for your widgets instead of User Widget,
and get the following behaviour:
## Initial focus
Set the Initial Focus Widget Name to the name of a focusable widget in this panel.
When the panel os attached to the viewport, this widget will be given the focus.
## Remembering focus
This widget provides `SavePreviousFocus` and `RestorePreviousFocus` methods
which can save / restore focus as needed. They are not called by default but
are used in [Menus](Menus.md).