inplace editors in DBAdvGrid

how can i place a combobox-editor in a fixed cell??  i'm using a DBAdvGrid with 2 fixed rows, the 1st. row is as usually for the columns captions (column header), now i want to use the 2nd row (which is fixed) to place comboboxes in each cell. Those comboboxes are filled with values from which the user can select to filter the data table.

 
regards.

This capability was only added in the latest version of the base class TAdvStringGrid.

See use of MouseActions.FixedRowsEdit / MouseActions.FixedRowsEditor on page 54 of the TAdvStringGrid developers guide.