Row Layer
The row layer can be used to display additional information in each row by registering specialized row renderers. The renderer lookup is based on the type of the hierarchy / tree node. Row renderers accept a flag, which signals them whether the row that they are rendering is the current focus owner. This flag will only be supported by the row layer if the focus support feature is enabled.
Relevant API
void RowLayer.setPaintingFocus(boolean);
void RowLayer.setRowRenderer(Object, IRowRenderer);
IRowRenderer