'宣言
Public Class _ItemsQueryGrouping Inherits _DataModel Implements IDataModel, GrapeCity.DataVisualization.Chart.IGrouping(Of DataValueType), IQueryGrouping, GrapeCity.DataVisualization.Chart.ITreeNode(Of IQueryGrouping)
public class _ItemsQueryGrouping : _DataModel, IDataModel, GrapeCity.DataVisualization.Chart.IGrouping<DataValueType>, IQueryGrouping, GrapeCity.DataVisualization.Chart.ITreeNode<IQueryGrouping>