Rendering issue with WPF controls inside ElementHost
this.Loaded += delegate{ var source = PresentationSource.FromVisual(this); var hwndTarget = source.CompositionTarget as HwndTarget; if (hwndTarget != null) { hwndTarget.RenderMode = RenderMode.SoftwareOnly; }};Try using that in the wpf control you are hosting. This is a known rendering issue of the the wpf controls that are hosted in win forms. Changing the rendering mode to software only will solve the problem.
I had a similar problem and solved forcing a refresh of the ElmenetHost in the scroll event of the TableLayoutPanel
Ok, this is gonna sound like total B.S. but it worked for me: in the Load event of your form, resize the form.
public class MyForm : Form{ public MyForm() { Load += (o, e) => { Width -=1; Width +=1; }; }}After the form has been resized, I could not force a display issue.