Shows the selection.
<p>
If there is no selection or the selection
is already visible, this method does nothing.
If the selection is scrolled out of view,
the top index of the widget is changed such
that selection becomes visible.
@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>
Shows the selection. <p> If there is no selection or the selection is already visible, this method does nothing. If the selection is scrolled out of view, the top index of the widget is changed such that selection becomes visible.
@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>