Why would MessageBox.Show show a blank message?

Question

I have the following code for a gallery control inside a user control that is used in an XAF Property editor.

I am using a MessageBox to troubleshoot why the OnPaint method sometimes fails. However the MessageBox itself displays a blank message when it is located near the bottom of the screen.

using DevExpress.XtraBars.Ribbon;
using DevExpress.XtraBars.Ribbon.Gallery;
using System;
using System.Windows.Forms;

namespace MyApp.Module.Win.Features.Jama.Editors.ThinWorkflow
{
    public class MyGalleryControl : GalleryControl
    {
        protected override GalleryControlGallery CreateGallery() { return new myGallery(this); }

        protected override void OnPaint(PaintEventArgs args)
        {
            try
            {
                base.OnPaint(args);
            } catch(Exception ex)
            {
                MessageBox.Show($"In OnPaint:inner {ex.InnerException} :full:{ex.Message}", "MyGalleryControl:OnPaint");
                // throw new Exception("In OnPaint");
            }
        }
    }
}

Answer 1

I think it happens when the text is long enough to cause a line wrap off the screen.