Contains the text to display in the corresponding column heading of a data grid.
包含了显示在Datagrid对应的列标题上的内容
Delphi 语法：
property DisplayLabel: String;
C++ 语法：
__property AnsiString DisplayLabel = {read=GetDisplayLabel, write=SetDisplayLabel, stored
=IsDisplayLabelStored};
详细内容：
Use DisplayLabel to assign column headings to a data grid.
使用 DisplayLabel赋值Datagrid的列标题
The column headings of the data grid use the DisplayName property of the field whose value they represent.
Data grid的列标题使用字段的DisplayName属性值便是DisplayLabel指定的。
Setting DisplayLabel changes the read-only DisplayName property from FieldName to the string specified as DisplayLabel.
设置DisplayLabel可以改变只读属性DisplayName与FieldName所指定的DisplayLabel值一致。
