Custom DataSource request keeps "Contacting Server..." modal window open

[matuszemi]

Hi there,
What I'm trying to achieve:
SelectItem (multiple-select of all music bands available) loads all records (music bands) from BandDS. Custom request on EventDS (below) loads only band assigned to one particular event. I plan to use this as "values" for SelectItem. (if there is some better way to achieve this please advice?).

Problem I'm facing:
I've got problem with custom request. It keeps the window open saying: "Contacting Server..." and does not close after it receives the response. Also DSCallback.execute() is never executed.
All works without this custom request. (please notice I run multiple requests simultaneously).

Thanks for help.
Matus

SmartGWT 2.2
Firefox 3.6.12

            Record record = new Record();
	    record.setAttribute("id", id);
	    EventDS.getInstance().performCustomOperation("bands", record, new DSCallback() {
			@Override
			public void execute(DSResponse response, Object rawData,
					DSRequest request) {
				//update values
			}
	    	
	    },
	    new DSRequest());

                Criteria liveCriteria = new Criteria("type", "LIVE");
		liveCriteria.addCriteria(eventCriteria);
		streamLiveForm.fetchData(liveCriteria);
		
		Criteria archiveCriteria = new Criteria("type", "ARCHIVE");
		archiveCriteria.addCriteria(eventCriteria);
		streamArchiveForm.fetchData(archiveCriteria);
		
		Criteria downlaodCriteria = new Criteria("type", "DOWNLOAD");
		downlaodCriteria.addCriteria(eventCriteria);
		streamDownloadForm.fetchData(downlaodCriteria);

[ym]

did you find a solution?
I'm having the same problem myself.