Enables the receiver if the argument is <code>true</code>,
and disables it otherwise. A disabled menu item is typically
not selectable from the user interface and draws with an
inactive or "grayed" look.
@param enabled the new enabled state
@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>
Enables the receiver if the argument is <code>true</code>, and disables it otherwise. A disabled menu item is typically not selectable from the user interface and draws with an inactive or "grayed" look.
@param enabled the new enabled state
@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>