ListGridField.setSortByDisplayField does not pick up .ds.xml's displayField="FIELD"

[Blama]

Hi Isomorphic,

I have following code:

.ds.xml fields:

<field foreignKey="T_CAMPAIGN.ID" name="CAMPAIGN_ID" [B]displayField="CAMPAIGN_NAME"[/B] type="integer"></field>
<field name="CAMPAIGN_NAME" includeFrom="T_CAMPAIGN.NAME" hidden="true"></field>

ListGrid:

...
ListGridField campaignLGF = new [B]ListGridFieldCampaign[/B]("CAMPAIGN_ID");
setSort(new SortSpecifier[] { new SortSpecifier("CAMPAIGN_ID", SortDirection.ASCENDING) });
setFields(campaignLGF, ...);
fetchData();

ListGridFieldCampaign:

public final class ListGridFieldCampaign extends ListGridField {

	public ListGridFieldCampaign(final String name) {
		super(name);
		[B]TRY WITH OR WITHOUT: setDisplayField("CAMPAIGN_NAME");[/B]
		setSortByDisplayField(true);
	}
}

Depending on setDisplayField("CAMPAIGN_NAME") in ListGridFieldCampaign the fetch() sorts by either T_CAMPAIGN.ID or T_CAMPAIGN.NAME.
I think it should always sort by T_CAMPAIGN.NAME (because of the displayField="CAMPAIGN_NAME" in .ds.xml). Is that true?

Best regards,
Blama