/// <summary>
/// Compares to.
/// </summary>
/// <param name="obj">
/// The object.
/// </param>
/// <returns>
/// </returns>
public int CompareTo(object obj)
{
if (obj == null)
{
return(1);
}
AttributeModel secondSource = (AttributeModel)obj;
// compare on Page first TODO compare on Page?
int testFlag = GType.CompareTo(secondSource.GType);
return(testFlag);
}