Dyanamic Layout from XML file

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C#

C#4.0

XML-documentation

Here is my code :
use to get "CheckMark" tag from XML file listed bel

foreach (XmlNode node in DOC.SelectNodes("//CheckMarkObject"))
           {


               FbCheckMark checkmark = new FbCheckMark();


               checkmark.Name = node.SelectSingleNode("Name").InnerText;
               checkmark.Label = node.SelectSingleNode("Label").InnerText;

               if (node.SelectSingleNode("IsChecked").InnerText == "0")
               {
                   checkmark.IsChecked = false;
               }
               else
               {
                   checkmark.IsChecked = true;
               }

               listCheckMarks.Add(checkmark);

           }

now and this is the control code for generating against this tag:

for (int i = 0; i < listCheckMarks.Count; i++)
{
if (listCheckMarks[i].checkMark.Equals(checkMark))
{

CheckBox cb = new CheckBox();
TextBlock cbtextblock = new TextBlock();
cbtextblock.Text = listCheckMarks[i].Label;
cbtextblock.Height = 27;
cbtextblock.HorizontalAlignment = System.Windows.HorizontalAlignment.Left;
cbtextblock.Margin = new Thickness(12, 20, 0, 0);
cbtextblock.VerticalAlignment = System.Windows.VerticalAlignment.Top;
cb.HorizontalAlignment = System.Windows.HorizontalAlignment.Left;
cb.VerticalAlignment = System.Windows.VerticalAlignment.Top;
cb.Margin = new Thickness(150, 21, 0, 0);
cb.Height = 50;
cb.Width = 100;
cb.Name = listCheckMarks[i].Name;




LayoutRoot.Children.Add(cbtextblock);
LayoutRoot.Children.Add(cb);

}
}

now my question is that when i use "CheckMark" tag 2 time. it generate checkmark control 2 times. but it overwrite the previous control.
plzz tell me the answer what can i do for this. that the new control come after the previous one. thanks