谁用过DEV的propertyGridControl控件？

为什么输入项什么都输不进去呢？源码如下：RepositoryItemTextEdit txt = new RepositoryItemTextEdit();
                    EditorRow  row = new EditorRow();
            row.Properties.Caption = "姓名";
            row.Properties.RowEdit = txt;
            this.propertyGridControl1.Rows.Add(row);