We want to create a new CComboController which manages background colors: light blue if value is 'R', Red if value is 'NC 17', default otherwise.
In Eclipse IDE, open file $projectDirectory/resources/xml/include/detail/FilmDI.xml.

package org.mycompany.myproject.gencode.custom;
 
import org.adichatz.engine.controller.IContainerController;
import org.adichatz.engine.controller.field.CComboController;
import org.adichatz.engine.core.ControllerCore;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
 
public class RatingCComboController extends CComboController {
 
    public RatingCComboController(String id,
            IContainerController parentController, ControllerCore genCode) {
        super(id, parentController, genCode);
    }
 
    @Override
    public void createControl() {
        super.createControl();
        getCCombo().addSelectionListener(new SelectionAdapter() {
            @Override
            public void widgetSelected(SelectionEvent e) {
                setRatingBackGroundColor();
            }
        });
    }
 
    @Override
    public void setValue(Object value) {
        super.setValue(value);
        setRatingBackGroundColor();
    }
 
    private void setRatingBackGroundColor() {
        String value = getCCombo().getText();
        // Use 'setCssBackground' rather than 'getControl().setBackground' to be compliant with css process.
        // Otherwise when changing css theme current color is lost.
        if ("NC-17".equals(value))
            setCssBackground("#adichatz-common", "error-foreground-color");
        else if ("R".equals(value))
            setCssBackground("#adichatz-common", "title-background");
        else
            setCssBackground(null, null);
    }
}