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This error occurs: - System.InvalidOperationException: 'Window must be the root of the tree. Cannot add Window as a child of Visual.' I want to open another WPF window inside the stack panel. If WPF window can't open, then give some other good option. 

What I have tried:

private ObjectPlacement objectPlacement;

private void Button_Click_4(object sender, RoutedEventArgs e)
    ObjectPlacement W = new ObjectPlacement();// other WPF window
    settingpanel.Children.Add(objectPlacement);//setting panel is stack panel.
Updated 24-Feb-23 1:30am
[no name] 23-Jan-23 4:34am    
You can't; the closest thing is a user control (that looks like a window).

WPF does not have Windforms MDI. You can use a Frame with Pages or ContentControl with UserControls (easiest).

Here, watch this. This will show you how to do what you want: WPF Switching Views With Navigation Using MVVM And Dependency Injection - YouTube[^]
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private void Object_placement_Click(object sender, RoutedEventArgs e)
           UserControl1 newFormControl = new UserControl1();
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