VS2008 Windows Form Designer does not like my control

public partial class MYControl : MyControlBase
{
    public string InnerText {
        get { return textBox1.Text; }
        set { textBox1.Text = value; }
    }
    public MYControl()
    {
        InitializeComponent();
    }
}

partial class MYControl
{
    /// <summary>
    /// Required designer variable.
    /// </summary>
    private System.ComponentModel.IContainer components = null;

    /// <summary>
    /// Clean up any resources being used.
    /// </summary>
    /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
    protected override void Dispose(bool disposing)
    {
        if (disposing && (components != null))
        {
            components.Dispose();
        }
        base.Dispose(disposing);
    }

    #region Component Designer generated code

    /// <summary>
    /// Required method for Designer support - do not modify
    /// the contents of this method with the code editor.
    /// </summary>
    private void InitializeComponent()
    {
        this.textBox1 = new System.Windows.Forms.TextBox();
        this.listBox1 = new System.Windows.Forms.ListBox();
        this.label1 = new System.Windows.Forms.Label();
        this.SuspendLayout();
        //
        // textBox1
        //
        this.textBox1.Location = new System.Drawing.Point(28, 61);
        this.textBox1.Name = "textBox1";
        this.textBox1.Size = new System.Drawing.Size(100, 20);
        this.textBox1.TabIndex = 0;
        //
        // listBox1
        //
        this.listBox1.FormattingEnabled = true;
        this.listBox1.Location = new System.Drawing.Point(7, 106);
        this.listBox1.Name = "listBox1";
        this.listBox1.Size = new System.Drawing.Size(120, 95);
        this.listBox1.TabIndex = 1;
        //
        // label1
        //
        this.label1.AutoSize = true;
        this.label1.Location = new System.Drawing.Point(91, 42);
        this.label1.Name = "label1";
        this.label1.Size = new System.Drawing.Size(35, 13);
        this.label1.TabIndex = 2;
        this.label1.Text = "label1";
        //
        // MYControl
        //
        this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
        this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
        this.Controls.Add(this.label1);
        this.Controls.Add(this.listBox1);
        this.Controls.Add(this.textBox1);
        this.Name = "MYControl";
        this.Size = new System.Drawing.Size(135, 214);
        this.ResumeLayout(false);
        this.PerformLayout();

    }

    #endregion


    private System.Windows.Forms.Label label1;
}

protected System.Windows.Forms.TextBox textbox1;
protected System.Windows.Forms.ListBox listbox1;