Returns the accessible object for the receiver.
If this is the first time this object is requested,
then the object is created and returned.
@return the accessible object
@exception SWTException <ul>
<li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
<li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
</ul>
Returns the accessible object for the receiver. If this is the first time this object is requested, then the object is created and returned.
@return the accessible object
@exception SWTException <ul> <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> </ul>
@see Accessible#addAccessibleListener @see Accessible#addAccessibleControlListener
@since 2.0