Returns the single instance of the system tray or null when there is no system tray available for the platform.
@return the system tray or <code>null</code>
@exception SWTException <ul> <li>ERROR_DEVICE_DISPOSED - if the receiver has been disposed</li> </ul>
@since 3.0
See Implementation
Returns the single instance of the system tray or null when there is no system tray available for the platform.
@return the system tray or <code>null</code>
@exception SWTException <ul> <li>ERROR_DEVICE_DISPOSED - if the receiver has been disposed</li> </ul>
@since 3.0