this.btnSearch.addSelectionListener(new SelectionAdapter() {
	@Override
	public void widgetSelected(SelectionEvent e) {
		Thread operationThread = new Thread() {
			public void run() {
				// time-consuming operations
				// Get requested data from Application Server
				//...
				
				display.syncExec(new Runnable() {
					public void run() {
						// UI Updating procedures go here ...
						underlyingLayer.getEventList().clear();
						underlyingLayer.getEventList().addAll(partsList);
					}
				});
			}
		};

		operationThread.start();
	}
}