protected void assignSelection(FacesContext context, Organigram component, OrganigramNode node) {
        ValueExpression ve = component.getValueExpression("selection");
        ve.setValue(context.getELContext(), node);
    }
Checks if the current request is a selection request and
assigns the found {@link OrganigramNode} to the <code>selection</code> value expression.

@param context    The current {@link FacesContext}.
@param component The {@link Organigram} component.
primefaces/src/main/java/org/primefaces/component/organigram/OrganigramRenderer.java