private void DuplicateSelected()
{
var newItems = new List <IShape>();
var selectedShapes = SelectedShapes.ToList();
for (int i = selectedShapes.Count - 1; i >= 0; i--)
{
var oldItem = selectedShapes[i];
var newItem = oldItem.Clone() as IShape;
oldItem.IsSelected = false;
newItem.Left += 10;
newItem.Top += 10;
newItems.Add(newItem);
}
foreach (var item in newItems)
{
Visuals.Add(item);
}
}