Selects all of the items in the receiver.
<p>
If the receiver is single-select, do nothing.
@exception SWTException <ul>
<li>ERROR_THREAD_INVALID_ACCESS when called from the wrong thread
<li>ERROR_WIDGET_DISPOSED when the widget has been disposed
</ul>
Selects all of the items in the receiver. <p> If the receiver is single-select, do nothing.
@exception SWTException <ul> <li>ERROR_THREAD_INVALID_ACCESS when called from the wrong thread <li>ERROR_WIDGET_DISPOSED when the widget has been disposed </ul>