Custom panel with layout engine

I'm trying to create a custom Panel control with my own layout engine. I need every control that is added to my panel to be added below and to take full width (-padding), like below:

Below is my code:

using System.Drawing;
using System.Windows.Forms;
using System.Windows.Forms.Layout;

namespace VContainer
{
    internal class VerticalFillList : Panel
    {
        public VerticalFillList()
        {
            AutoScroll = true;
            MinimumSize = new Size(200, 200);
            Size = new Size(200, 300);
            Padding = new Padding(10);
        }

        private readonly VerticalFillLayout _layoutEngine = new VerticalFillLayout();

        public override LayoutEngine LayoutEngine
        {
            get { return _layoutEngine; }
        }

        private int _space = 10;

        public int Space
        {
            get { return _space; }
            set
            {
                _space = value;
                Invalidate();
            }
        }
    }

    internal class VerticalFillLayout : LayoutEngine
    {
        public override bool Layout(object container, LayoutEventArgs layoutEventArgs)
        {
            var parent = container as VerticalFillList;

            Rectangle parentDisplayRectangle = parent.DisplayRectangle;
            Point nextControlLocation = parentDisplayRectangle.Location;

            foreach (Control c in parent.Controls)
            {
                if (!c.Visible)
                {
                    continue;
                }

                c.Location = nextControlLocation;
                c.Width = parentDisplayRectangle.Width;
                nextControlLocation.Offset(0, c.Height + parent.Space);
            }
            return false;
        }
    }
}

Above code works fine, except one thing: when I'm adding controls to my container they are added correctly (new below pa