Pointer is typically of type CComponentsForm or derived classes,
default intialized with NULL and serves to access for
properties of parent object by embedded items.
If items are used in forms it can be usefully to have a variable
which contains the real position on screen.
This can happen e.g. if an item contains separate render methods, because within forms
usual x/y values related to form dimensions and be converted.
Handling of minitv items are different to other item types
and need an explizit call of hide(). So it is possible to hide a form-
object without a extra call of hide() for minitv objects.
It's easier to work with smaller files.
Most files contain only one cc-class and their names are
derived on the particular class that is contained therein.