@Override public AbstractLayerSourceAssistantPage getNextPage() { LayerSourceDescriptor selected = (LayerSourceDescriptor) list.getSelectedValue(); if (selected == null) { return null; } LayerSource layerSource = layerSourceMap.get(selected); LayerSourcePageContext pageContext = getContext(); pageContext.setLayerSource(layerSource); return layerSource.getFirstPage(pageContext); }