C# 多个窗体之间查找控件

1.在Form5 中 放一个分隔Panel，加载的时候显示一个窗体在里面： 
private void Form5_Load(object sender, EventArgs e) 
        { 
            Form55 myfrom = new Form55(); 
            this.splitContainer1.Panel2.Controls.Clear(); 
            myfrom.TopLevel = false; 
            this.splitContainer1.Panel2.Controls.Add(myfrom); 
            myfrom.Show(); 
        } 
2. 在Form55 窗体中，增加一个按钮，用来查找到splitContainer这个，然后再另外一个分隔页面中添加另一个窗体。 
private void button1_Click(object sender, EventArgs e) 
        { 
           // Form myform = this.Parent.FindForm(); 
             // Form myform = (Form)this.FindForm().Parent.FindForm(); 
            //Form myform = this.ParentForm(); 
           // Label myLabel = this.Parent.FindForm().Controls.Find("label1",true)[0] as Label; 
           // Label myLabel = this.Parent.FindForm().Controls.Find("label1", true)[0] as Label; 
           // myform.Text = "MY Form"; 
          //  myLabel.Text = "test mylabel"; 
           // Form myform = this.Parent.FindForm();//上一级窗体的Form 
            showForm(); 
        } 
        private void showForm() 
        { 
            Form3 form3 = new Form3(); 
            form3.TopLevel = false; 
            SplitContainer splitContainer = this.Parent.FindForm().Controls.Find("splitContainer1",true)[0]  as SplitContainer; 
            splitContainer.Panel1.Controls.Clear(); 
            splitContainer.Panel1.Controls.Add(form3); 
            form3.Show(); 
        }