# Question about GDropList in G4P library
**URL:** https://discourse.processing.org/t/question-about-gdroplist-in-g4p-library/20045
**Category:** Libraries
**Created:** [April 22, 2020, 9:02pm UTC](https://discourse.processing.org/t/question-about-gdroplist-in-g4p-library/20045 "2020-04-22T21:02:27Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@David](https://discourse.processing.org/u/David)
#### Post date: [April 22, 2020, 9:02pm UTC](https://discourse.processing.org/t/question-about-gdroplist-in-g4p-library/20045/1 "2020-04-22T21:02:28Z")
I’m having trouble using a droplist. I’ve looked at the examples and read through the user guides on the web site, but I can’t see what I’m doing wrong. In all the examples I’ve tried, the droplist collapses after the user makes a selection, but when I run the code below, the list never collapses (although the selection is returned to the program). What am I doing wrong?
```auto
import g4p_controls.*;
String dest[] = {"Selection 1","Selection 2","Selection 3"};
GDropList dropList1;
public void setup() {
size(600,400,JAVA2D);
G4P.messagesEnabled(false);
G4P.setMouseOverEnabled(false);
dropList1 = new GDropList(this, 20, 20, 120, 200, 10);
dropList1.addEventHandler(this, "dropListHandler");
dropList1.setItems(dest,0);
}
public void draw() {
}
public void dropListHandler (GDropList source, GEvent event) {
println("dropList >> GEvent." + event + " @ " + millis());
println("selected text = "+source.getSelectedText());
}
```
---
### Author:  [@David](https://discourse.processing.org/u/David)
#### Post date: [April 23, 2020, 1:04pm UTC](https://discourse.processing.org/t/question-about-gdroplist-in-g4p-library/20045/2 "2020-04-23T13:04:39Z")
@quark I’m not sure if this is a bug or just something I don’t understand, but I discovered that if I added a line to the draw() method, it works. Here’s what the draw() method looks like now:
```auto
public void draw() {
background(230);
}
```
That’s the only change I made. Is this expected behaviour?
Thanks.
---
### Author:  [@quark](https://discourse.processing.org/u/quark)
#### Post date: [April 23, 2020, 1:57pm UTC](https://discourse.processing.org/t/question-about-gdroplist-in-g4p-library/20045/3 "2020-04-23T13:57:44Z")
This is not a bug, G4P _ **requires** _ you to use either background() or some other command to remove the previous control image for every frame.