Making Refresh on Viewport3D

Question

Dear all,

I am working on a 3D application using WPF. I am importing a 3D file in a viewport and i am doing some modification on that object( Move some of the object..)

I would like to make a sort of refresh of my figure to take in consideration the new changes( The equivalent of update in the windows Form). I am using the Thread.Sleep(1000);
to make the sleep .

Thanks you for your help.

Sondos