How to close a UserControl View in mvvm-light?

I've craeted a sample with mainView and 2 other views (usercontrols). I've placed a button "close" on the child view and i want to close that view. there is a command atta开发者_开发问答ched to that button, and when close is pressed i ask the ViewModelLocator to clean it.

BUt- the view still being displayed.. What i'm doing wrong? How can i close a userControl view with mvvm-light?

    private RelayCommand _closeCommand;
    public RelayCommand CloseCommand
    {
        get
        {
            if (_closeCommand == null)
            {
                _closeCommand = new RelayCommand(()=>
                   ViewModelLocator.ClearAllChannels(),

                   );
            }
            return _closeCommand;
        }

    }

ViewModelLocator function:

    public static void ClearAllChannels()
    {
        if (_allChannels != null)
        {
            _allChannels.Cleanup();
            _allChannels = null;
        }
    }

The ViewModelLocator does not actually host your views. It just provides a way to look up the ViewModel that supports a particular view.

So you need to ask the control that hosts your views (probably a Window or Frame) to close them.