How to using code auto changed toolTipfield infomation in AX

其实在InventSize上定义titlefield1和tilefield2是没有问题的，关键是InventDim上的方法tooltipfield改变了显示的内容而已，只要在这里修改一下，就可以达到目的了。

当某个Inventdim在Form中选择父数据源有字段为ItemId的时候,该窗体栏顶端总是显示Item number信息.

public str toolTipField(fieldId _fieldId)
{
    str             ret;
    FormDataSource  formDataSource;
    formDatasource  formDatasourceJoined;
    fieldId         fieldId;
    ItemId          itemId;

    ret = super(_fieldId);

    switch(_fieldId)
    {
        case fieldNum(InventDim, configId):
        case fieldNum(InventDim, inventSizeId):
        case fieldNum(InventDim, inventColorId):
        case fieldNum(InventDim, inventBatchId):
            formDataSource = this.dataSource();
            if (formDataSource && formDataSource.table() == tableNum(InventDim))
            {
                formDatasourceJoined = formGetParentDatasource(formDataSource);
                if (formDatasourceJoined)
                {
                    fieldId = fieldName2Id(formDatasourceJoined.table(),fieldstr(InventTable,itemId));
                    if (fieldId)
                    {
                        itemId = formDatasourceJoined.cursor().(fieldId);
                        if (itemId)
                        {
                            ret = strfmt("@SYP183", itemId, this.(_fieldId));
                            return ret;
                        }
                    }
                }
            }
            return strfmt("%1", this.(_fieldId));
    }

    return ret;
}