code: private Class<? extends WComponent> getRowRendererClass() {
  		RowIdWrapper wrapper = getCurrentRowIdWrapper();
  		if (wrapper != null) {
  			return table.getTableModel().getRendererClass(wrapper.getRowIndex());
  		}
  		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.