When transparency is enabled, layered mode is automatically used if it is supported (see the Overview for details). This function allows you to override that behavior and force masked mode to be used instead.
First available in version 3.0 build 2039.
flag - A boolean value that indicates whether transparency should be rendered using masks instead of layered window support. 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.