function fnAddStandaloneBusyIndicator () {
		// if there's already a busy block state, remove it first before creating a new one
		// the existing busy block state can't be reused, because the block layer DOM is removed by the renderer. A new
		// block layer needs to be created
		if (this._oBusyBlockState) {
			BlockLayerUtils.unblock(this._oBusyBlockState);
		}

		this._oBusyBlockState = BlockLayerUtils.block(this, this.getId() + "-busyIndicator", this._sBusySection);
		BusyIndicatorUtils.addHTML(this._oBusyBlockState, this.getBusyIndicatorSize());
	}
Adds a standalone BusyIndicator.
The block-layer code is able to recognize that a new block-layer is not needed.