Create heavy ui element in another wpf thread

This is the working code (but on the UI thread):

<ContentControl 
                Width="{Binding Path=ActualWidth, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ListView}}}" 
                Focusable="True"  
                HorizontalAlignment="Right" 
                Content="{Binding Work}" >
            </ContentControl>

      

        
        
        
      

    

This is the code I'm trying to do instead, but it doesn't work: (codebehind)

            InitializeComponent();

            var thread = new Thread(
                () =>
                {
                    var a = new ContentControl { Focusable = true, HorizontalAlignment = HorizontalAlignment.Right };
                    var binding = new Binding { Path = new PropertyPath("Work"), };

                    a.SetBinding(ContentProperty, binding);
                    MainGrid.Dispatcher.Invoke(new Action(() => { MainGrid.Children.Add(a); }));
                }) { IsBackground = true };
            thread.SetApartmentState(ApartmentState.STA);
            thread.Start();

      

        
        
        
      

    

My goal is to create ConentControl

and place it on a grid that is inside listview

with multiple ContentControls

.) The displayed solution fails because another thread belongs MainGrid

. Anyone have good ideas for this? (I would like to do this in a different thread, because it is ContentControl

heavy, for example, 3 seconds to create a layout. This is a general view that creates itself according to the parameters.)

EDIT:

The main problem is that my whole program freezes while creating these views. This is highly undesirable. My goal is to move this workload to another (or several) different thread (s).