code: private Class<? extends WComponent> getRowRendererClass() {
  		UIContext uic = UIContextHolder.getCurrent();
  
  		if (table.getDataModel() instanceof TreeTableDataModel && uic instanceof SubUIContext) {
  			int row = getRowIndex((SubUIContext) uic);
  			TreeTableDataModel dataModel = (TreeTableDataModel) table.getDataModel();
  
  			TableTreeNode node = dataModel.getNodeAtLine(row);
  			return node.getRendererClass();
  		}
  
  		return null;
  	}
docs: Retrieves the renderer class for a given row.
  
  @return the renderer class for a given row (if it's an expanded row), otherwise null.