Given a widget and a widget-specific id, returns the
instance of the <code>Widget</code> subclass which represents
the widget/id pair in the currently running application,
if such exists, or null if no matching widget can be found.
@param widget the widget
@param id the id for the subwidget (usually an item)
@return the SWT subwidget (usually an item) that the widget/id pair represents
@exception SWTException <ul>
<li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
<li>ERROR_DEVICE_DISPOSED - if the receiver has been disposed</li>
</ul>
Given a widget and a widget-specific id, returns the instance of the <code>Widget</code> subclass which represents the widget/id pair in the currently running application, if such exists, or null if no matching widget can be found.
@param widget the widget @param id the id for the subwidget (usually an item) @return the SWT subwidget (usually an item) that the widget/id pair represents
@exception SWTException <ul> <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> <li>ERROR_DEVICE_DISPOSED - if the receiver has been disposed</li> </ul>
@since 3.3