Is it possible to update tooltip text?

[Ye Wenbin]

Hi,
I am wondering whether there is a function to update the text display in  
the
tooltip. Maybe the tooltip is not what I what, because I think tooltip will
disappear when user input something. I want a frame the display text like
tooltip, and I can update the text according to user's input and hide
it when needed.
I think such feature is useful, for example it can be used for displaying
candicate expansions or using by input methods. I try x-show-tip, but
the frame display and disappear too often.

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Best Regards,
Ye Wenbin