
Anyway, the features I posted are (Tickets 51 and 52):

It should be possible to switch the component with the keyboard focus by pressing the "Tab" key. Also, "Shift-Tab" should be used to navigate backwards.
Optionally, components like "MultiLineEditbox" might want to handle "Tab" keystrokes, generating "extra spaces" in the text, and not changing the Focus.

It should be possible to make a scrollbar thumb component vary its size to reflect the contents being displayed.
The height of the thumb of a vertical scrollbar (and, simmetrically, the width of the thumb of a horizontal scrollbar) should change automatically (if some property is set) to reflect the ratio between PageSize and DocumentSize scrollbar properties.
The math to that would be something like this:
ThumbHeight = TrackSize*(PageSize/DocumentSize)
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Leonardo Mesquita