TGCompositeFrame

 Create a composite frame. A composite frame has in addition to a TGFrame
 also a layout manager and a list of child frames.

 Create a frame using an externally created window. For example
 to register the root window (called by TGClient), or a window
 created via TVirtualX::InitWindow() (id is obtained with TVirtualX::GetWindowID()).

 Delete a composite frame.

 Return kTRUE if frame is being edited.

 Switch ON/OFF edit mode.
 If edit mode is ON it is possible:

  1. embed other ROOT GUI application (a la ActiveX)

  For example:
    TGMainFrame *m = new TGMainFrame(gClient->GetRoot(), 500, 500);
    m->SetEditable();
    gSystem->Load("$ROOTSYS/test/Aclock"); // load Aclock demo
    Aclock a;
    gROOT->Macro("$ROOTSYS/tutorials/gui/guitest.C");
    m->SetEditable(0);
    m->MapWindow();

 Cleanup and delete all objects contained in this composite frame.
 This will delete all objects added via AddFrame().
 CAUTION: all objects (frames and layout hints) must be unique, i.e.
 cannot be shared.

 Set the layout manager for the composite frame.
 The layout manager is adopted by the frame and will be deleted
 by the frame.

 Set broken layout. No Layout method is called.

 Set edit disable flag for this frame and subframes

  - if (on & kEditDisable) - disable edit for this frame and all subframes.

 Change composite frame options. Options is an OR of the EFrameTypes.

 Turn on automatic cleanup of child frames in dtor.

 if mode = kNoCleanup    - no automatic cleanup
 if mode = kLocalCleanup - automatic cleanup in this composite frame only
 if mode = kDeepCleanup  - automatic deep cleanup in this composite frame
                           and all child composite frames (hierarchical)

 Attention!
    Hierarchical cleaning is dangerous and must be used with caution.
    There are many GUI components (in ROOT and in user code) which do not
    use Clean method in destructor ("custom deallocation").
    Adding such component to GUI container which is using hierarchical
    cleaning will produce seg. violation when container is deleted.
    The reason is double deletion: first whem Clean method is invoked,
    then at "custom deallocation".
    We are going to correct all ROOT code to make it to be
    consitent with hierarchical cleaning scheeme.

 Add frame to the composite frame using the specified layout hints.
 If no hints are specified default hints TGLayoutHints(kLHintsNormal,0,0,0,0)
 will be used. Most of the time, however, you will want to provide
 specific hints. User specified hints can be reused many times
 and need to be destroyed by the user. The added frames cannot not be
 added to different composite frames but still need to be deleted by
 the user.

 Remove frame from composite frame.

 Map all sub windows that are part of the composite frame.

 Hide sub frame.

 Show sub frame.

 Get state of sub frame.

 Get state of sub frame.

 Get state of sub frame.

 Layout the elements of the composite frame.

 Print all frames in this composite frame.

 Change background color for this frame and all subframes.

 Get frame located at specified point.

 Translate coordinates to child frame.

 Handle drag enter event.

 Handle drag leave event.

 Handle drag motion event.

 Handle drop event.

 Auxilary protected method  used to save subframes.

 Save a composite frame widget as a C++ statement(s) on output stream out.