Internal global property..bad smell?

public class MapinfoWrapper
{
    public MapinfoWrapper()
    {
        Publics.InternalMapinfo = new MapinfoWrapper();
    }

    public void Do(string cmd)
    {
        //Call COM do command
    }

    public string Eval(string cmd)
    {
        //Return value from COM eval command
    }
}

internal static class Publics
{
    private static MapinfoWrapper _internalwrapper;
    internal static MapinfoWrapper InternalMapinfo
    {
        get
        {
            return _internalwrapper;
        }
        set
        {
            _internalwrapper = value;
        }
    }
}

public class TableInfo
    {
        public string Name {
            get { return Publics.InternalMapinfo.Eval("String comman to get the name"); }
            set { Publics.InternalMapinfo.Do("String command to set the name"); }
        }
    }

public class TableInfo
{
     private IMapinfoWrapper wrapper;

     public TableInfo() : this(null) {}

     public TableInfo( IMapinfoWrapper wrapper )
     {
          // use from cache if not supplied, could create new here
          this.wrapper = wrapper ?? Publics.InternalMapInfo;
     }

     public string Name {
        get { return wrapper.Eval("String comman to get the name"); }
        set { wrapper.Do("String command to set the name"); }
     }
}

public interface IMapinfoWrapper
{
    void Do( string cmd );
    void Eval( string cmd );
}

public class MapinfoWrapper
{
    public MapinfoWrapper()
    {
    }

    public void Do(string cmd)
    {
        //Call COM do command
    }

    public string Eval(string cmd)
    {
        //Return value from COM eval command
    }
}

internal static class Publics
{
    private static MapinfoWrapper _internalwrapper;
    internal static MapinfoWrapper InternalMapinfo
    {
        get
        {
            if (_internalwrapper == null)
            {
                _internalwrapper = new MapinfoWrapper();
            }
            return _internalwrapper;
        }
    }
}

[TestMethod]
[ExpectedException(typeof(ApplicationException))]
public void TestTableInfoName()
{
     IMapinfoWrapper mockWrapper = new MockMapinfoWrapper();
     mockWrapper.ThrowDoException(typeof(ApplicationException));

     TableInfo info = new TableInfo( mockWrapper );
     info.Do( "invalid command" );
}