Class: TEgFireGrid
property CornerImageIndex: Integer default -1;Icon shown in the corner cell, the cell above the indicator gutter
and left of the titles, as an index into Images; -1 (the
default) shows none. The corner exists only with
egoIndicator and egoTitles in Options.
The icon is shrunk to fit the corner, keeping its proportions, and
placed by CornerImageAlignment.
A click on it, with either mouse button, fires OnCornerImageClick,
and the pointer over it shows ClickableCursor.
A typical use is a menu of grid-wide actions (choose columns, export,
reset the layout).
With the touch multi-selection active, a tap on the corner clears the
selection (see TouchSelection).