Class: TEgFireGridCellControl
property ImageIndex: Integer;This cell’s icon, as an index into the grid’s Images; -1 for
none. It arrives in OnBeforeDrawCell
as the column’s ImageIndex;
a handler may change it for this cell, to show an icon only on some rows
or a different icon per row. A click on it fires OnCellImageClick.
The column’s ShowImageOnEmpty
and ImageOnSelectedOnly
still decide whether it shows.