# ComboBox + CellRenderer = Breakage!

**URL:** <https://forum.kirupa.com/t/combobox-cellrenderer-breakage/308770>\
**Category:** flash\
**Created:** [April 29, 2010, 6:55pm UTC](https://forum.kirupa.com/t/combobox-cellrenderer-breakage/308770 "2010-04-29T18:55:00Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![FlashHed](https://avatars.discourse-cdn.com/v4/letter/f/e480ec/32.png) [@FlashHed](https://forum.kirupa.com/u/FlashHed)\
**Post date:** [April 29, 2010, 6:55pm UTC](https://forum.kirupa.com/t/combobox-cellrenderer-breakage/308770/1 "2010-04-29T18:55:00Z")

</div>

FIXED (sort of…):

Basically what was happening was that when I try to deactivate individual cells within a list of a combo box it would break down in a for loop due to null cell renderer references, I think this had something to do with the fact that when you reference the combo box dropdown, which is a list, you’re only getting a reference to that list through a getter, which may work at first but doesn’t seem too stable.

So in short I got around this by just using a list and creating a button above it that looked like a combo box, then I would just toggle the list visibility when you click the combo.

So it seems cell renderer and combobox don’t get along too well

SEE PROBLEM BELOW:

Hi,

I’m trying to disable certain rows within a combobox dropdown, the problem I run into is if I have too many items within my combobox the Cell Renderer traces out null after about 4 or 5 items ( when I have 5 + ).

Has anyone had any luck with custom comboboxes or any pointers for working with ComboBox, SimpleCollectionItem and CellRenderer?

example:

var item:SimpleCollectionItem = storeCmb.getItemAt(i) as SimpleCollectionItem;

var cr:CellRenderer = storeCmb.dropdown.itemToCellRenderer( item ) as CellRenderer;

cr.enabled = false;

EDIT:

Changing the code to this helped:

var item:SimpleCollectionItem = storeCmb.getItemAt(i) as SimpleCollectionItem;

// Added  
var list:List = storeCmb.dropdown as List;

var cr:CellRenderer = storeCmb.dropdown.itemToCellRenderer( item ) as CellRenderer;

cr.enabled = false;

EDIT:  
it broke again… ■■■■ combobox!