* However this should be reset when user switches from one mode to another.
*/
private volatile boolean lookupWarningShown = false;
public void initializeParticipants() {
ISourceLookupParticipant participant = new LookupParticipant(this);
addParticipants(new ISourceLookupParticipant[] { participant } );
// Check mode post factum.
checkSupportedLookupMode();
}