public void AddItem(TItem item)
{
var commandAdd = new CommandAdd <TItem>(Items, item);
SizeStack.Push(commandAdd);
commandAdd.Do();
}
public void AddItem(TItem item)
{
//Items.Add(item);
ICommand <TItem> command = new CommandAdd <TItem>(item);
Commands.Push(command);
command.Do(Items);
}