Tooltip for datagrid's cells

I know how to create a tooltip for datagrid and/or its
columns. Is it possible to create a tooltip (or something similar)
for each cell? So whenever the mouse is over a certain cell, a tip
would be shown for that cell that depends on the value of the cell.
Similar functionality can often be seen in web-based database apps:
an Ajax query gets related data from a database on mouseOver.
My need and idea is to
- show a simple text list as a tooltip
- the text would be fetched from a database via a web service
- the fetch would be based on datagrid's (hidden) rowid and
each column's (hidden) column id (which are real database columns)
- the database structure is an n:m relation i.e. one
rowid+colid can refer to several items that are then used in the
tooltip
Use case: A number is displayed in the datagrid. The need is
to display 0-n references related to that specific figure (e.g.
book names, notes etc) in the tooltip. Next cell's tooltip would be
showing different references.
Anybody any ideas or suggestions? Thanks!

Hi,
Did you try creating a custom itemRenderer and handling the
mouse events for that item renderer component. There is also a
property called dataTipFunction, please check that too.
Hope this helps.

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