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This section describes container managing. How to create, destroy, manage them and all their callbacks.
The ObjContainer or container :

• owns an offscreen buffer, where all the graphical objects are blitted when they are modified by user event or received methods
• owns a objects' tree ; an object is added as the last child of his father
• the objects' tree blit in the buffer is son as first child before: group of objects can be easily hidden or shown

Two types of ObjContainer exist:

• the window container which works like an ObjWin, that is why many functions are common between these two objects
• the virtual container which is not linked to a window.It is never visible: it is only a buffer where the user can interact with by calling methods' functions. (The virtual container can be usefull for 3d when user want to create interface on 3d by making texture with the container buffer)

Be carefull because all functions do not work with all types of containers

ObjContainer ( )