Is is possible to adapt the attached sketch so that mousing over level 1 box would open two knobs rather than two rectangles?

cheers,

josh

2. import controlP5.*;
3. 
   
4. ControlP5 controlP5;
5. MultiList l;
6. 
   
7. void setup() {
8.   size(400,400);
9.   frameRate(30);
10.   controlP5 = new ControlP5(this);
11.   
12.   // add a multiList to controlP5.
13.   // elements of the list have default dimensions
14.   // here, a width of 100 and a height of 12
15.   l = controlP5.addMultiList("myList",0,10,100,12);
16.   
17.   // create a multiListButton which we will use to
18.   // add new buttons to the multilist
19.   MultiListButton b;
20.   b = l.add("level1",1);
21.   
22.   // add items to a sublist of button "level1"
23.   b.add("level11",11).setLabel("level1 item1");
24.   b.add("level12",12).setLabel("level1 item2");
25. 
    
26.   b = l.add("level2",2);
27.   
28.   int cnt = 100;
29.   
30.   // add some more sublists.
31.   for(int i=0;i<10;i++) {
32.     MultiListButton c = b.add("level2"+(i+1),20+i+1);
33.     c.setLabel("level2 item"+(i+1));
34.     c.setColorBackground(color(64 + 18*i,0,0));
35.     
36.     if(i==4) {
37.     // changing the width and the height of a button
38.     // will be inherited by its sublists.
39.     c.setWidth(100);
40.     c.setHeight(20);
41.     }
42.     cnt++;
43.     
44.     if(i==4) {
45.       for(int j=0;j<10;j++) {
46.         cnt++;
47.         MultiListButton d;
48.         d = c.add("level2"+i+""+j,250+j+1);
49.         d.setLabel("level2 item"+(i+1)+" "+"item"+(j+1));
50.         d.setColorBackground(color(64 + 18*j,(64 + 18*j)/2,0));
51.         d.setId(cnt);
52.         d.setWidth(200);
53.       }
54.     }
55.   }
56.   
57.   MultiListButton cc = (MultiListButton)controlP5.controller("level21");
58.   cc.setHeight(40);
59. }
60. 
    
61. 
    
62. void controlEvent(ControlEvent theEvent) {
63.   println(theEvent.controller().name()+" = "+theEvent.value());  
64.   // uncomment the line below to remove a multilist item when clicked.
65.   // theEvent.controller().remove();
66. }
67. 
    
68. 
    
69. void draw() {
70.   background(0);
71. }
72. 
    
73. void keyPressed() {
74.   if(controlP5.controller("level23")!=null) {
75.     println("removing multilist button level23.");
76.     controlP5.controller("level23").remove();
77.   }
78. }