Hello!

Sorry for my English in advance

I will have class "Graph" in the file "Graph.h". I want to have a widget which I can "Promote to ..." from Qt Designer, like in the picture:
279.png

Must I inherit QwtPlot and QWidget? How to show the plot?
Qt Code: 
  1. #ifndef GRAPH_H
  2. #define GRAPH_H
  3.  
  4. #include <QWidget>
  5. #include <qwt_plot.h>
  6.  
  7. class Graph : public QWidget, QwtPlot
  8. {
  9. public:
  10.     Graph()
  11.     {
  12.  
  13.     }
  14. };
  15.  
  16. #endif // GRAPH_H
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