如何设置工具提示的部分样式，例如粗体？我在 itemrenderer 中为数据网格生成工具提示，显示列名，然后显示值：我想将值显示为粗体…</p>
public override function set data(value:Object):void
{
var dg:DataGrid = this.listData.owner as DataGrid;
var dataField:String = (dg.columns[this.listData.columnIndex] as DataGridColumn).dataField;
var toolString:String = “”;
for(var i:int = 0; i < dg.columns.length; i++)
{
var fieldName:String = (dg.columns[i] as DataGridColumn).dataField;
toolString = StringUtil.substitute("{0}{1}: {2}\n", toolString, fieldName, displayString(value[fieldName]));
}
this.toolTip = toolString;
super.data = value;
this.text = displayString(value[dataField]);
}