tray-item-tooltip

Arguments: tray-item

Returns the string that is used for the tooltip that appears when the user pauses the mouse over the tray-item-icon for the specified tray-item, or else nil when no tooltip is displayed. The initial value is nil.

The value to use may be specified by passing it as the :tooltip initarg value to make-instance when creating the tray-item, or anytime later by passing the value to (setf tray-item-tooltip).

A tray icon tooltip string may be at most 63 characters long. An error is signaled if a longer string is specified.

tray-item must be an instance of the tray-item class, as created with make-instance.

See the description of the tray-item class for an example.

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Created 2010.1.21.