Rendering issue with WPF controls inside ElementHost

Question

I am having a WinForms control, inside that I have a TableLayoutPanel which holds multiple ElementHosts and each ElementHost contains a WP

Answer 1

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.

Answer 2

I had a similar problem and solved forcing a refresh of the ElmenetHost in the scroll event of the TableLayoutPanel

Answer 3

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.