Returns the <code>Display</code> that is associated with
the receiver.
<p>
A widget's display is either provided when it is created
(for example, top level <code>Shell</code>s) or is the
same as its parent's display.
</p>
@return the receiver's display
@exception SWTException <ul>
<li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
</ul>
Returns the <code>Display</code> that is associated with the receiver. <p> A widget's display is either provided when it is created (for example, top level <code>Shell</code>s) or is the same as its parent's display. </p>
@return the receiver's display
@exception SWTException <ul> <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> </ul>