Show or hide the window caption (title) at runtime. When the caption is enabled, the window border is enabled as well. When the caption is disabled, only the caption is disabled, the border remains enabled.
First available in version 3.0 build 2039.
flag - A true/false flag that determines whether the caption will be visible or not. Valid values include: true and false.
No output parameters.
When this method is called synchronously, a return object containing the output parameters is returned to the caller immediately.