Returns the region that defines the shape of the shell,
or null if the shell has the default shape.
@return the region that defines the shape of the shell (or null)
@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 region that defines the shape of the shell, or null if the shell has the default shape.
@return the region that defines the shape of the shell (or null)
@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