Child WPF on top of parent WPF (MvvmCross)

Question

I would like to open a new WPF window on top of the parent window, or at least where the mouse is. I can receive the correct mouse coordinates, but it does not update the Left and Top attribute correctly, means no effect but it works when I use hard-coded coordinates

this.Left = System.Windows.Input.Mouse.GetPosition(null).X;
this.Top = System.Windows.Input.Mouse.GetPosition(null).Y;

So I try to use WindowStartupLocation="CenterOwner" in the WPF, but I do not know how to set the parent WPF in MvvmCross. I call the child window like this by the parent ViewModel:

ShowChildCommand = new MvxAsyncCommand(async () => await NavigationService.Navigate<ChildViewModel>());

but it does not supply any option to set a parent. My child WPF class looks this:

using MvvmCross.Platforms.Wpf.Presenters.Attributes;

namespace test.wpf.Views
{
    [MvxWindowPresentation(Identifier = nameof(ChildView), Modal = false)]
    public partial class GroupMembershipView
    {
        public ChildView()
        {
            InitializeComponent();
        }

    }

}

Besides I tried to figure out how to set it maybe in WPF itself:

Owner="{x:Static test.wpf:App.CurrentMainWindow}

But no success. What is the correct way to define the parent, or just set the new WPF window on top in MvvmCross?

Answer 1

I think I missed something one following post: How to set window's owner to MainWindow through XAML in WPF?

so, I added the mentioned function to my App.xaml.cs

public static MvxWindow CurrentMainWindow
{
    get { return (MvxWindow)Current.MainWindow; }
}

and in the WPF like mentioned in the post:

xmlns:test.wpf="clr-namespace:test.wpf"
WindowStartupLocation="CenterOwner" Owner="{x:Static test.wpf:App.CurrentMainWindow}"