问如何可靠地引用包含的表单

EN

class MyButton : Button, ISupportInitialize
{
    public void BeginInit()
    {
        var parent = this.TopLevelControl;
    }

    public void EndInit()
    {
        var parent = this.TopLevelControl;
    }
}

private void InitializeComponent()
{
    this.myButton1 = new Quartz1.MyButton();
    ((System.ComponentModel.ISupportInitialize)(this.myButton1)).BeginInit();
    this.SuspendLayout();
    // 
    // myButton1
    // 
    this.myButton1.Location = new System.Drawing.Point(371, 338);
    this.myButton1.Name = "myButton1";
    this.myButton1.Size = new System.Drawing.Size(75, 23);
    this.myButton1.TabIndex = 4;
    this.myButton1.Text = "myButton1";
    this.myButton1.UseVisualStyleBackColor = true;
    // 
    // Form1
    // 
    this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
    this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
    this.ClientSize = new System.Drawing.Size(1012, 440);
    this.Controls.Add(this.myButton1);
    this.Name = "Form1";
    this.Text = "Form1";
    ((System.ComponentModel.ISupportInitialize)(this.myButton1)).EndInit();
    this.ResumeLayout(false);
    this.PerformLayout();
}