listBox scrollbar gets messed up if define the height < 10 during creation

[GoogleCodeExporter]

What steps will reproduce the problem?
/**
 * ControlP5 ListBox
 * listBox operates the same way as a scrollList, but
 * is optimized for many items (1000+). using a listBox
 * over a scrollList is recommended
 * by andreas schlegel, 2009
 */

import controlP5.*;

ControlP5 controlP5;

ListBox l;
int cnt = 0;
void setup() {
  size(400,400);
  frameRate(30);
  controlP5 = new ControlP5(this);
  l = controlP5.addListBox("myList",100,100,0,0); //Setting the height < 10 creates a scrollbar issue.
  l.setItemHeight(15);
  l.setBarHeight(15);

  l.captionLabel().toUpperCase(true);
  l.captionLabel().set("something else");
  l.captionLabel().style().marginTop = 3;
  l.valueLabel().style().marginTop = 3; // the +/- sign
  //l.setBackgroundColor(color(100,0,0));
  for(int i=0;i<80;i++) {
    l.addItem("item "+i,i);
  }
  l.setColorBackground(color(255,128));
  l.setColorActive(color(0,0,255,128));
  l.setHeight(120);   //Setting the height later does not fix the issue
  l.setWidth(120);

}

void keyPressed() {
  if(key=='1') {
    // set the height of a listBox should alwyays be a multiple of itemHeight
    l.setHeight(210); 
  } 
  else if(key=='2') {
    // set the height of a listBox should alwyays be a multiple of itemHeight
    l.setHeight(120);
  }
  else if(key=='i') {
    // set the height of a listBoxItem, should alwyays be a fraction of the listBox
    l.setItemHeight(30); 
  } 
  else if(key=='u') {
    // set the height of a listBoxItem, should alwyays be a fraction of the listBox
    l.setItemHeight(10);
    l.setBackgroundColor(color(100,0,0));
  } 
  else if(key=='a') {
    int n = (int)(random(100000));
    l.addItem("item "+n, n);
  } 
  else if(key=='d') {
    l.removeItem("item "+cnt);
    cnt++;
  }
}

void controlEvent(ControlEvent theEvent) {
  // ListBox is if type ControlGroup.
  // 1 controlEvent will be executed, where the event
  // originates from a ControlGroup. therefore
  // you need to check the Event with
  // if (theEvent.isGroup())
  // to avoid an error message from controlP5.

  if (theEvent.isGroup()) {
    // an event from a group e.g. scrollList
    println(theEvent.group().value()+" from "+theEvent.group());
  }
}

void draw() {
  background(128);
  // scroll the scroll List according to the mouseX position
  // when holding down SPACE.
  if(keyPressed && key==' ') {
    //l.scroll(mouseX/((float)width)); // scroll taks values between 0 and 1
  }
  if(keyPressed && key==' ') {
    l.setWidth(mouseX);
  }
}

What is the expected output? What do you see instead?
Normal scrollbar

What version of the product are you using? On what operating system?
0.5.4, Max OSX 10.6.5

Please provide any additional information below.
Setting the height to 10 during creation is a work around.

Original issue reported on code.google.com by jeffgem...@gmail.com on 12 Nov 2010 at 3:25

[GoogleCodeExporter]

Why would you set the width and height to 0 or smaller 10? the height of a 
listbox should at least be equal or bigger than the itemheight with a minimum 
value of 10. if the listbox should be made invisible with above technique, 
could setVisible(false) do the job? or would collapsing the listbox help (use 
close() )?

Original comment by soj...@gmail.com on 13 Nov 2010 at 5:19

• Changed state: WontFix

[GoogleCodeExporter]

I calculate the height and width later in the program based on some other 
variables.  So what I was doing was initially creating the listBox at 0,0,0,0, 
then setting the position and size later in the program.  Of course I was able 
to work around this by setting an initial size greater than 10, but I thought I 
should let you know.

Original comment by jeffgem...@gmail.com on 13 Nov 2010 at 2:17

[GoogleCodeExporter]

I did look at the code and it would be easy enough to fix if you change your 
mind.

ListBox.java

80   _myBackgroundHeight = theH;  //You could do a simple _myBackgroundHeight = 
theH < 10 ? 10;

Original comment by jeffgem...@gmail.com on 13 Nov 2010 at 2:25

[GoogleCodeExporter]

Opps.. these comments should allow edit.  (also I'm not that great at Java 
shorthand, so double check the statement).

ListBox.java

80   _myBackgroundHeight = theH;  //You could do a simple _myBackgroundHeight = 
theH < 10 ? 10 : theH;

Original comment by jeffgem...@gmail.com on 13 Nov 2010 at 2:27