Specify whether the close button appears
when the user hovers over an unselected tabs.
@param visible <code>true</code> makes the close button appear
@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>
Specify whether the close button appears when the user hovers over an unselected tabs.
@param visible <code>true</code> makes the close button appear
@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>
@since 3.0