Location of usercontrol is not updated correctly in flowlayout

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Globalization;


namespace Elements
{
    /// <summary>
    /// A custom windows control to display text vertically
    /// </summary>
    [ToolboxBitmap(typeof(VerticalLabel), "VerticalLabel.ico")]
    public class VerticalLabel : UserControl
    {
        private DrawMode drawMode = DrawMode.TopDown;
        private bool transparent = false;

        private void VerticalLabel_Resize(object sender, System.EventArgs e)
        {
            if (AutoSize)
            {
                Graphics g = CreateGraphics();
                Size textLength = g.MeasureString(Text, Font).ToSize();

                this.Height = Margin.Top + textLength.Width + Margin.Bottom;
                this.Width = Margin.Left + textLength.Height + Margin.Right;
            }
        }

        public VerticalLabel()
        {
            CreateControl();
            Name = "VerticalLabel";
            Location = new Point();
            Margin = new Padding();
            AutoSize = true;
            AutoSizeMode = AutoSizeMode.GrowAndShrink;
            BackColor = Color.Transparent;
            Margin = new Padding(1);
            SetStyle(ControlStyles.Opaque, true);
            Resize += new EventHandler(VerticalLabel_Resize);
        }

        protected override void OnPaint(System.Windows.Forms.PaintEventArgs e)
        {
            float labelControlWidth;
            float labelControlHeight;
            float labelTransformX;
            float labelTransformY;

            Color controlBackColor = BackColor;
            Pen labelBorderPen;
            SolidBrush labelBackColorBrush;

            if (transparent)
            {
                labelBorderPen = new Pen(Color.Empty, 0);
                labelBackColorBrush = new SolidBrush(Color.Empty);
            }
            else
            {
                labelBorderPen = new Pen(controlBackColor, 0);
                labelBackColorBrush = new SolidBrush(controlBackColor);
            }

            SolidBrush labelForeColorBrush = new SolidBrush(ForeColor);
            base.OnPaint(e);
            labelControlWidth = Size.Width;
            labelControlHeight = Size.Height;
            e.Graphics.DrawRectangle(labelBorderPen, 0, 0, labelControlWidth, labelControlHeight);
            e.Graphics.FillRectangle(labelBackColorBrush, 0, 0, labelControlWidth, labelControlHeight);
            e.Graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;

            if (this.TextDrawMode == DrawMode.BottomUp)
            {
                labelTransformX = 0;
                labelTransformY = labelControlHeight;
                e.Graphics.TranslateTransform(labelTransformX, labelTransformY);
                e.Graphics.RotateTransform(270);
                e.Graphics.DrawString(Text, Font, labelForeColorBrush, Margin.Top, Margin.Left);
            }
            else
            {
                labelTransformX = labelControlWidth;
                labelTransformY = labelControlHeight;
                e.Graphics.TranslateTransform(labelControlWidth, 0);
                e.Graphics.RotateTransform(90);
                e.Graphics.DrawString(Text, Font, labelForeColorBrush, Margin.Bottom, Margin.Right);
            }
        }

        protected override CreateParams CreateParams
        {
            get
            {
                CreateParams cp = base.CreateParams;
                cp.ExStyle |= 0x20;
                return cp;
            }
        }
  
        public override string Text
        {
            get { return base.Text; }
            set
            {
                base.Text = value;
                Invalidate();
            }
        }

        public DrawMode TextDrawMode
        {
            get { return drawMode; }
            set { drawMode = value; }
        }

        public bool TransparentBackground
        {
            get { return transparent; }
            set { transparent = value; }
        }

        protected override void OnTextChanged(EventArgs e)
        {
            VerticalLabel_Resize(null, null);
        }

        protected override void OnFontChanged(EventArgs e)
        {
            VerticalLabel_Resize(null, null);
        }

        protected override void OnAutoSizeChanged(EventArgs e)
        {
            VerticalLabel_Resize(null, null);
        }
    }

    public enum DrawMode
    {

        BottomUp = 1,

        TopDown
    }
}