Some problemes to bind datas to a report

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Hi,

i would bind a report with datas. i have a DAL method returns a collection of A objects contains a B object list.
List of A object contains properties and a list of B object.

i would fill my report's textboxes  with A properties and a table with A list of B object.
the DAL method is called from a aspx page with a reportviewer and a reportbook.

my reportviewer is correctly displayed but with empty reports.

Filling the report with A object properties works. but filling the table of the report with A object's List<B> does'nt work.

i fill my cells with =Fields.property

in the aspx page, i bind my report with the object with : report.Datasource = A object;

How can i fill my table?
thanks

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problem solved by the code.