GrapeCity.Win.Editors.GcComboBox问题

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自己重写了两个GcComboBox，一个
   public ExGcCboSel()
      {
         InitializeComponent();
         this.SideButtons.Clear();
         this.ContentAlignment = ContentAlignment.MiddleLeft;
         this.Ellipsis = GrapeCity.Win.Editors.EllipsisMode.EllipsisEnd;
         this.HighlightText = true;
         this.ImeMode = ImeMode.Off;
         this.ShowOverflowTip = true;
         this.AutoCompleteMode = AutoCompleteMode.SuggestAppend;
         this.AutoCompleteSource = AutoCompleteSource.ListItems;
         this.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
         this.Font = new System.Drawing.Font("Meiryo UI", 9.75F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(128)));
      }
另一个
      public ExGcCboSelAutoComp()
      {
         InitializeComponent();
         this.SideButtons.Clear();
         this.ContentAlignment = ContentAlignment.MiddleLeft;
         this.Ellipsis = GrapeCity.Win.Editors.EllipsisMode.EllipsisEnd;
         this.HighlightText = true;
         this.ImeMode = ImeMode.Off;
         this.ShowOverflowTip = true;
          this.AutoComplete.MatchingMode = GrapeCity.Win.Editors.AutoCompleteMatchingMode.ExactMatchAll;
         this.AutoCompleteMode = AutoCompleteMode.Suggest;
         this.AutoCompleteSource = AutoCompleteSource.ListItems;
         this.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
         this.Font = new System.Drawing.Font("Meiryo UI", 9.75F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(128)));
      }
但是第一个可以实现上下方向键选择模糊匹配的项目。但是第二个上下方向键就只能选择原本所有的项目。可能描述的不清楚，下面我会贴图说明。
第一种下键点击可以选中模糊匹配到的。

第二种模糊匹配结果。

方向下键点击出现的是最开始的数据源项目