SparkClient/ViewModel/BaseWindow/MainViewModel.cs

namespace SparkClient.ViewModel.BaseWindow;

public class MainViewModel : BaseViewModel
{
    private object _content;
    
    public object Content { get { return _content;  } set { _content = value; OnPropertyChanged("Content");  } }

    public MainViewModel()
    {
        Content = new HomeWindowVM();
        WindowManager.openContent.Add(Content);
    }
}