Display own widget in new window

[time]

No. If you don't want a memory leak, then create the QChartView with the MainWindow as a parent. The chart view will then be deleted when the main window is deleted, whether the chart view is visible or not.

Oh, ok. Can I ask you for simple example how to do that? How to create QChartView as a parent of MainWindow?

[d_stranz]

How to create QChartView as a parent of MainWindow?

No, no. Your QChartView should be a child of MainWindow. See that there are two QChartView constructors; in Line 21 of your code above use the one that takes a QWidget * parent argument and use "this" (your MainWindow instance) as the value for "parent".