Is is possible for a program to set the state of Wt scroll bars?

1) I have a log window, built from a WTextArea.  When I add messages to the 
bottom, I'd like to insure the text at the bottom of the window is visible.  I 
don't see any methods to force the scroll "thumb" to the bottom, so the users 
sees the last log mesage.

2) I have a WSelectionBox that shows a set of names, corresponding to what scan 
a radar antenna is performing.  There may be more scans than would fit in the 
vertical space, so I need a scrollbar.  How do make sure the current state is 
always visible?
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