provides the possibility of setting and retrieving the position
of the current cell in a grid control.
Note that a grid control does not allow free control over the current row:
In such a control, every line represents a row of data of the underlying
::com::sun::star::form::component::DataForm. Thus, the current
row of the grid control always equals the current row of the
::com::sun::star::form::component::DataForm, and can be affected only
by changing the latter.
The current column of a grid control, whoever, can be freely controlled.
