Returns the Cocoa view of a cocoa-view-pane.
The function cocoa-view-pane-view returns the Cocoa view for the cocoa-view-pane
as a foreign pointer. This view is only accessible when the pane is visible and
is returned in other cases.
is implemented only in LispWorks for Macintosh with the Cocoa IDE. See the
LispWorks Objective-C and Cocoa Interface User Guide and Reference Manual
for details on using Cocoa.