When labelFunction for datagrid is called?

I have a datagrid with three columns, and there is a
labelFunction for one of the columns.
I add a breakpoint in side of the labelFunction, I found that
the labelFunction is called 4 times.
when labelFunction for datagrid column is called? why there
is so many calls of labelFunction
PS:
I set data provider for datagrid in creationComplete event of
the datagrid, and the data provider just contains one item.

labelFunction is called for every row/item, and for each
column that has the labelFunction specified.
Sometimes I have found the label function is called with a
null item. I am in the habit of checking for null in all
labelFunctions.
Tracy

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