C#

namespace Tabcontrol 
{    
    public partial class PresetTab : UserControl   //3rd Tabitem ,preset.xaml.cs 
    {         
        public PresetTab() 
        { 
            InitializeComponent();             
        } 
        public  void AddPresetmenu(string pMenu)     
        { 
           menubox.Items.Add(pMenu);    //menubox is listbox 
        }  
    }     
} 

namespace Tabcontrol 
{   
    public partial class ToolBar : UserControl 
    { 
        PresetTab tab = new PresetTab();      
        public ToolBar() 
        {             
            InitializeComponent();  
        } 
         public void Click(object sender, MouseButtonEventArgs e) 
         {          
          tab.AddPresetmenu(menu);      //Im calling from tabcontrol,toolbar.xaml.cs                
            } 
     } 
}

private void ShowQuestionsAndAnswers(ArrayList questions, ArrayList answers)
        {
           
           
           
            groupBox2.Enabled = true;
            j = 0;

            for (int i = 0; i < questions.Count; i++)
            {
                tbp.Invalidate();
                j = i;
                ArrayList ans = new ArrayList();
                
                GroupBox gb = new GroupBox();
                //gb.AutoSize = true;
                gb.Size = new Size(tbp.Width - 100, 150);
                tbp.Controls.Add(gb); // Adding the groupbox to the main table panel added during design time.
                TableLayoutPanel tbp2 = new TableLayoutPanel();// a panel for the controls inside the group box
                tbp2.ColumnCount = 1; // ensure that there is only one column in the panel inside the group box
                tbp2.AutoSize = true;
                gb.Controls.Add(tbp2);// add the panel in the group box
                // Make the controls (a label and four radiobuttons)i want to use ready
                Label newLabel = new Label();
                //gb.Text = examsQuestions[i].ToString();
                newLabel.Text = (i + 1).ToString() + ". " + questions[i].ToString();
                newLabel.AutoSize = true;
                newLabel.BringToFront();
                newLabel.Size = new Size(1000, 100);
                RadioButton rdb1 = new RadioButton();
                rdb1.AutoSize = true;
                tbp2.SetRow(rdb1, 1);
                rdb1.Text = a[0].ToString();
                rdb1.Click += new EventHandler(rdb_Click);
                


                RadioButton rdb2 = new RadioButton();
                rdb2.AutoSize = true;
                tbp2.SetRow(rdb2, 2);
                rdb2.Text = a[1].ToString(); ;
                rdb2.Click += new EventHandler(rdb_Click);

                RadioButton rdb3 = new RadioButton();
                rdb3.AutoSize = true;
                rdb3.Text = a[2].ToString(); ;
                rdb3.Click += new EventHandler(rdb_Click);

                RadioButton rdb4 = new RadioButton();
                rdb4.AutoSize = true;
                rdb4.Text = a[3].ToString();
                rdb4.Click += new EventHandler(rdb_Click);

                Control[] ctrl = { newLabel,rdb1,rdb2,rdb3,rdb4 };

                tbp2.Controls.AddRange(ctrl);
                a.RemoveRange(0, 5);

            }
           
            Button btnDone = new Button();
            btnDone.Text = "Done";
            btnDone.Click += new EventHandler(btnDone_Click);
            tbp.Controls.Add(btnDone);

            StartTimer();
            

        }