R – .NET WinForms grid with multiple scrollbars

This one shows the synchronization with the neighboring PropertyGridView. Note you will have to extend it to handle the user clicking on either control. This version updates propertyGrid2 to match propertyGrid1, but not vice versa.

using System;
using System.Windows.Forms;
using System.Reflection;

namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        Control m_pgv_1 = null;
        Control m_pgv_2 = null;
        MethodInfo m_method_info;

        public Form1 ()
        {
            InitializeComponent ();

            // Set the Property Grid Object to something
            propertyGrid1.SelectedObject = dataGridView1;
            propertyGrid2.SelectedObject = dataGridView1;

            // Loop through sub-controlls and find PropertyGridView
            m_pgv_1 = FindControl (propertyGrid1.Controls, "PropertyGridView");
            m_pgv_2 = FindControl (propertyGrid2.Controls, "PropertyGridView");

            // Reflection trickery to get a private/internal field
            // and method, scrollBar and SetScrollOffset in this case
            Type type = m_pgv_1.GetType ();
            FieldInfo f = FindField (type, "scrollBar");
            m_method_info = FindMethod (type, "SetScrollOffset");

            // Get the scrollBar for our PropertyGrid and add the event handler
            ((ScrollBar)f.GetValue (m_pgv_1)).Scroll +=
                new ScrollEventHandler (propertyGrid1_Scroll);
        }

        private void propertyGrid1_Scroll (object sender, ScrollEventArgs e)
        {
            System.Console.WriteLine ("Scroll");

            // Set the new scroll position on the neighboring
            // PropertyGridView
            object [] parameters = { e.NewValue };
            m_method_info.Invoke (m_pgv_2, parameters);
        }

        private static Control FindControl (
            Control.ControlCollection controls, string name)
        {
            foreach (Control c in controls)
            {
                if (c.Text == name)
                    return c;
            }

            return null;
        }

        private static MethodInfo FindMethod (Type type, string method)
        {
            foreach (MethodInfo mi in type.GetMethods ())
            {
                if (method == mi.Name)
                    return mi;
            }

            return null;
        }

        private static FieldInfo FindField (Type type, string field)
        {
            FieldInfo f = type.GetField (field,
               BindingFlags.Instance | BindingFlags.NonPublic);

            return f;
        }
    }
}

You have three choices.

1. Make vertical scroll bar visible by default for both the scroll viewers (for header and inner) so when inner scroll viewer requires vertical scroll, vertical scroll bar just get enabled without taking any more space.

2. Bind width property of each columns in header with corresponding columns in grids in rows. so when width of a column of row grid changes it will also change width of corresponding column of header. this will also help you to give a facility to user to re size columns by dragging their borders. but it will require more codes.

3. Make vertical bar of inner scroll viewer visible and set right margin on header which is equal to width of vertical scroll bar.