This class is only be used to set the #itsMng of the GralWidget
before the class level initialization stuff of the constructor are processed.
The order in Java for ctor initialization is:
- first the super class (and its super class) where this cannot be used,
but argument values can be used if there are part of the superclass argument list.
- second all class level initialization stuff (immediately initialization of class object members)
is executed. This are also the anonymous interface implementations. Arguments of the ctor cannot be used.
- At least the statements of the ctor are executed. Only with this statements
a (final) class variable can be set from ctor arguments.
With this class first this super ctor of GralWidget is called, it sets the
GralWidgetSetMng#gralMng
which is accessible in the second phase.