Inform ProXL that Gc is no longer being "held onto" by the programmer. As soon as no drawables refer to it, Gc will be destroyed.
Warning: A gc is considered to be "held onto" when it is created,
or when it is got from a drawable (e.g.
It is the
responsibility of the programmer to ensure that she is not releasing
a gc that is being held by another branch of her code. For example,
If a gc is created, asserted somewhere, and put into a drawable, and later
is accessed through the drawable, the programmer must not release it
point, since it is still in the database and may be used. Be careful.