/// <summary>
/// Given a collection of items, adds those that are controls to the logical children.
/// </summary>
/// <param name="items">The items.</param>
private void AddControlItemsToLogicalChildren(IEnumerable items)
{
var toAdd = new List <ILogical>();
if (items != null)
{
foreach (var i in items)
{
var control = i as IControl;
if (control != null && !LogicalChildren.Contains(control))
{
toAdd.Add(control);
}
}
}
LogicalChildren.AddRange(toAdd);
}