In opposite to other form controls, grid controls do not only
display the single current value of a column they are bound to. Moreover, they do
display not only the current row of the form, but all rows (at least potentially, limited
by the control size, of course).
The table rows in a grid control correspond to the rows in the DataForm
the control belongs to, and the columns correspond to single columns of the form's row set.
Columns of a grid control are modeled by own objects, too. They are very similar to usual
::com::sun::star::form::DataAwareControlModel s modeling other "single-value" controls, but they are not described
as own services. Instead, they need to be created using the ::com::sun::star::form::XGridColumnFactory interface.