Improve chart graph

chartgraph.h

@@ -1,13 +1,13 @@
 #ifndef CHARTGRAPH_H
 #define CHARTGRAPH_H
 
-#include <QDialog>
+#include <QMainWindow>
 #include <QJSValue>
 #include <QChart>
 
 class ChartView;
 
-class ChartGraph : public QDialog
+class ChartGraph : public QMainWindow
 {
     Q_OBJECT
     QChart *_chart;
@@ -17,7 +17,6 @@ public:
     void plot(const QVariant &graph);
 public slots:
     void save();
-signals:
 };
 
 #endif // CHARTGRAPH_H