When you have a problem with a command, read its documentation at first. There you find, that close() required the handle of the figure or the "name":
"close name" deletes the figure with the specified name.
But what exactly is "the name"? Is this the 'Name' property? Does the 'NumberTitle' property matter? What about the title, when the name is empty?
I'd prefer to obtain the figure handle explicitly. Is it stored in the handles struct? Is it a parent of the currently called object? Does the figure have a unique tag or 'name' property? Is it possible that multiple instances of the GUI are opened, such that searchung for a tag or name may fail?
