Makes the dialog visible and brings it to the front
of the display.
@return the ID of the button that was selected to dismiss the
message box (e.g. SWT.OK, SWT.CANCEL, etc.)
@exception SWTException <ul>
<li>ERROR_WIDGET_DISPOSED - if the dialog has been disposed</li>
<li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the dialog</li>
</ul>
Makes the dialog visible and brings it to the front of the display.
@return the ID of the button that was selected to dismiss the message box (e.g. SWT.OK, SWT.CANCEL, etc.)
@exception SWTException <ul> <li>ERROR_WIDGET_DISPOSED - if the dialog has been disposed</li> <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the dialog</li> </ul>