private void removeRobot(int selected) {
		if(selected == -1 || selected >= selectedRobots.size()) {
			return;
		}
		selectedRobots.remove(selected);
		int size = selectedRobots.size();
		if(selected >= size) {
			selected = size - 1;
		}
		selectedRobotList.setSelectedIndex(selected);
		if(size == 0) {
			okButton.setEnabled(false);
		}
	}