WPF

foreach (UIElement el in LayoutRoot.Children)
{ 
   if (el is Button) 
   { 
        string shapestring = XamlWriter.Save(el);  
        StringReader stringReader = new StringReader(shapestring);
        XmlTextReader xmlTextReader = new XmlTextReader(stringReader);
        UIElement DeepCopyobject = (UIElement)XamlReader.Load(xmlTextReader);
        StackPanel1.Children.Add(DeepCopyobject); 
        LayoutRoot.Children.Remove(el);           
   }
}

List<int> itemsToRemove = new List<int>();
for ( int index = 0; index<LayoutRood.Children.Count; index++ )
{
      if ( LayoutRoot.Children[index] is Button )
           itemsToRemove.Add(index);
}
// Next process the items to move
foreach ( int element in itemsToRemove )
{
   Button oldElement = LayoutRoot.Children[element] as Button;
   LayoutRood.Children.RemoveAt(element);
   StackPanel1.Children.Add(oldElement);
}

Button newElement = new Button;
newElement.Name = oldElement.Name;
     .
     .
     .
// you get the idea
// now add the new instance of the button to the collection

<br />
           <x:XData><br />
                    <colors xmlns=""><br />

<br />
           <x:XData xmlns=""><br />
                    <colors ><br />

<StackPanel.Resources>
    <XmlDataProvider x:Key="InventoryData" XPath="Inventory/Books">
      <x:XData>
        <Inventory xmlns="">
          <Books>
            <Book ISBN="0-7356-0562-9" Stock="in" Number="9">
              <Title>XML in Action</Title>
              <Summary>XML Web Technology</Summary>
            </Book>

<UserControl ...
             ...
             Height="200" Width="400">



</UserControl>

MyUserControl uc = new MyUserControl();
uc.Height = 200.0;
uc.Width = 400.0;
...
...
...
LayoutRoot.Children.Add(uc);