Class: TEgFireGrid
property OnCornerImageClick: TEgFireGridCornerImageClickEvent;
TEgFireGridCornerImageClickEvent = procedure(Sender: TObject; Button: TMouseButton) of object;
Occurs when the corner cell’s icon (CornerImageIndex)
is pressed, with either mouse button or the finger; Button
tells which (TMouseButton.mbLeft for a tap). It exists on
the grid only, as the corner belongs to no column.