src/main/java/org/efaps/ui/wicket/models/objects/UIStructurBrowser.java
@Override
    public void setSortDirection(final SortDirection _sortDirection)
    {
        super.setSortDirection(_sortDirection);
        for (final UIStructurBrowser child : this.children) {
            child.setSortDirectionInternal(_sortDirection);
        }
    }
@Override
    public void setSortDirection(final SortDirection _sortDirection)
    {
        super.setSortDirection(_sortDirection);
        for (final UIStructurBrowser child : this.children) {
            child.setSortDirectionInternal(_sortDirection);
        }
    }
Setter method for instance variable {@link #sortDirection} and for all
children also.

@param _sortDirection value for instance variable {@link #sortDirection}