class myNiceClass : public TopWindow

class myNiceClass : public FrameCtrl<Ctrl> //both: Ctrl and Frame
class myNiceClass: public Ctrl //only Ctrl, not acting as a Frame 

 AddFrame(instanceOfMyNiceClass); //for the Frame version
Add(instanceOfMyNiceClass); //both only Ctrl and "Ctrl and Frame" 

ctrl ExampleCtrl {
   group "Complex"; //will add this Ctrl to the Complex group
   GetMinSize() {return Size(100,50);}
   GetStdSize() {return Size(400,150);}

   bool privateVar = true; // so you can configure your private variables in the Layout Designer

   Paint(w) {
      r = GetRect();
      //have a look at CtrlLib.usc for many usefull functions
      //but as far as i have read you can "only" draw rects, images and text

      //these three lines draw a white Ctrl with a black thin border
      w.DrawRect(r,:SBlack);
      DeflateRect(r); //makes the rect smaller by one on each side
      w.DrawRect(r,:SWhite);
   }

}

class MyCtrl {
...
   TopWindow win;

   void OpenAsWindow() {
      win.Add(this->SizePos());
      win.Open();
   }
};

class testcontrol : public Withtestcontrol<TopWindow>

class testcontrol : public FrameCtrl<Ctrl>

#include "mylayout.h"

#define LAYOUTFILE <test5/test5.lay>