fxruby users - May 2010 - attaching tooltip to FXTable

I''d like to attach a tooltop to an FXTable such that the text displayed
will
depend on where the mouse pointer is within the table.  After googling, it seems
the trick to associate a tooltip with a widget that doesn''t already
support it is:

connect(SEL_QUERY_TIP) do |sender, selector, data|
   sender.handle(self, FXSEL(SEL_COMMAND, ID_SETSTRINGVALUE),
''XXXX'')
end

The problem is how to replace ''XXXX'' with text that depends on
which cell the mouse
is hovering over.

I thought the first step might be to catch the mouse co-ordinates when the mouse
moves, but the following does''t seem to work, regardless of which
window it''s
attached to:

connect(SEL_MOTION) do |sender, selector, event|
   puts "#{event.win_x},#{event.win_y}"
end

-- 
Will