A Boolean value that indicates whether expansion tool tips are shown when the control is hovered over.
- macOS 10.8+
When the value of this property is
true, the expansion tool tip will expand;
false means the tool tip won’t expand. The default value is
Expansion tooltips are shown when the cell cannot show the full content and the user hovers the pointer over the control. This is controlled by the
NSCell class method
expansion and is drawn by
draw(with. This value is encoded along with the control.