Format individual treeitems javafx

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CSS

treeview

JavaFX

I am unable to understand how to use setCellFactory method to format individual TreeItems.

I have a class

public class Bag {
public String caption,assignment="";
Boolean eval;
public Set<Vertex> Nodes = new HashSet<Vertex>();
public Vector<Bag> ChildBags = new Vector<Bag>();

 @Override
public String toString()
{
    return assignment+ " " +caption;
}
}

Here's my css file:

.true{
    -fx-text-fill:#33cc00 ;
}
.assignment{
    -fx-text-fill: #0033cc
}

I have a treeview of bags. I want to color to green the caption ( the toString() method returns ) of all those nodes whose eval property is true. and assignment string which toString() method returns for all the nodes should be blue.

How can I do so?

Thanks.

What I have tried:

TreeView<Bag> treeView = new TreeView(root);

treeView.getStylesheets().add("format.css");

PseudoClass childPseudoClass = PseudoClass.getPseudoClass("child");

treeView.setCellFactory(tv -> new TreeCell<Bag>() {

    @Override
    protected void updateItem(Bag item, boolean empty) {
        super.updateItem(item, empty);
        if (empty || item == null) {

        } else {
            if(item.eval==true){
            //how to assign different style to different components
            }


        }

}
});