private void Pop()
{
Debug.Assert(_stack.Count > 1, "We never pop the root page.");
_stack.RemoveAt(_stack.Count - 1);
NotifyOfPropertyChange("Previous");
if (_stack.Count == 1)
{
GoBackCmd.RaiseCanExecuteChanged(_goBackCommand);
}
}
private void Push(T item)
{
Debug.Assert(_stack.Count == 0 || _stack[_stack.Count - 1] != item);
_stack.Add(item);
NotifyOfPropertyChange("Previous");
if (_stack.Count == 2)
{
GoBackCmd.RaiseCanExecuteChanged(_goBackCommand);
}
}