Initializes widget parameters and find dom element for displaying the tooltip widget
(see _findAreaMethodMapping values). Then create dom elements for the tooltip bubble
and connect the keyboard/mouse event handlers.
Depending on the orientation mode set by the forceOrientation variable move the tooltip
domNode to the position determined by currentYPosition and currentXPosition. This depends
on the document parenting the tooltip node as well as possible window scroll bars.
Hide the tooltip dom node before changing it. Then attach the layout classes and move the
tooltip frame to front. Finally attach the tooltip node to the dom tree and display it.