class TGViewPort: public TGCompositeFrame

TGCanvas and TGViewPort and TGContainer

A TGCanvas is a frame containing two scrollbars (a horizontal and
a vertical) and a viewport. The viewport acts as the window through
which we look at the contents of the container frame.

A TGContainer frame manages a content area. It can display and
control a hierarchy of multi-column items, and provides the ability
to add new items at any time. By default it doesn't map subwindows
which are items of the container. In this case subwindow must
provide DrawCopy method, see for example TGLVEntry class.
It is also possible to use option which allow to map subwindows.
This option has much slower drawing speed in case of more than 1000
 items placed in container. To activate this option the fMapSubwindows
data member must be set to kTRUE (for example TTVLVContainer class)

The TGContainer class can handle the keys:

o  F7, Ctnrl-F - activate search dialog
o  F3, Ctnrl-G - continue search
o  End - go to the last item in container
o  Home - go to the first item in container
o  PageUp,PageDown,arrow keys - navigate inside container
o  Return/Enter - equivalent to double click of the mouse button
o  Contrl-A - select/activate all items.
o  Space - invert selection.