Returns the receiver's disabled image if it has one, or null
if it does not.
<p>
The disabled image is displayed when the receiver is disabled.
</p>
@return the receiver's disabled image
@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 receiver's disabled image if it has one, or null if it does not. <p> The disabled image is displayed when the receiver is disabled. </p>
@return the receiver's disabled image
@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>