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private void Form1_Load(object sender, EventArgs e)
        {
            UserControl1 uc = new UserControl1();
            this.Controls.Add(uc);
        }					

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private void button1_Click(object sender, EventArgs e)
        {
            this.Controls.Clear();
            UserControl2 uc2 = new UserControl2();
            this.Controls.Add(uc2);
            
        }					

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        private void button1_Click(object sender, EventArgs e)
        {
            this.Controls.Clear();
            UserControl1 uc = new UserControl1();
            this.Controls.Add(uc);
        }					

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class cUserControl1_12
    {
            public UserControl[] uc_a = new UserControl[12];     
    }					

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public partial class Form1 : Form
    {
        cUserControl1_12 uc_s = new cUserControl1_12();
        public Form1()
        {
            InitializeComponent();
        }
        ...
    }					

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private void button2_Click(object sender, EventArgs e)
        {

            if (uc_s.uc_a[0] == null) //uc_s = klasse, uc_a= ArrayVonUserControls
            {   //erstelle ein neues UserControl1 Objekt, falls noch keins vorhanden ist
                uc_s.uc_a[0] = new UserControl1();
                this.Controls.Add(uc_s.uc_a[0]);
            }
            else
            {   //platziere das Objekt
                this.Controls.Add(uc_s.uc_a[0]); 
            }

                this.button1.Visible = true; //zurück-Button-einblenden
 
        }					

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        private void button1_Click(object sender, EventArgs e)
        {
            for (int i = 0; i < 12; i++)
                this.Controls.Remove(uc_s.uc_a[i]);

            this.button1.Visible = false; //zurück-Button-ausblenden
        }