# How to represent NULL in a checkbox - Clarion 10

**URL:** <https://clarionhub.com/t/how-to-represent-null-in-a-checkbox-clarion-10/3711>\
**Category:** questions\
**Created:** [December 18, 2020, 2:43pm UTC](https://clarionhub.com/t/how-to-represent-null-in-a-checkbox-clarion-10/3711 "2020-12-18T14:43:36Z")\
**Posts on this page:** 1\
**Showing post:** 8

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**Author:** ![CarlBarnes](https://clarionhub.com/user_avatar/clarionhub.com/carlbarnes/32/1859_2.png) [@CarlBarnes](https://clarionhub.com/u/CarlBarnes)\
**Post date:** [December 18, 2020, 5:13pm UTC](https://clarionhub.com/t/how-to-represent-null-in-a-checkbox-clarion-10/3711/8 "2020-12-18T17:13:48Z")

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> [@James\_Cooke](#):
>
> when I added state3 to the control, by hand, and closed the window and re-opened it, it was removed automatically. Mind you, I am in version 10 of CW.

State 3 works for me in the C10.12799 IDE Properties by checking “Enabled” in “Value 3rd State” then you must enter a State 3 Value. Also entering STATE3(‘#’) in the Window… Editor is retained. if no Value is entered in the IDE or in STATE3() then it gets ignored and lost on close.

 ![CheckState3](https://clarionhub-uploads.s3.eu-north-1.amazonaws.com/original/2X/2/2b743762b83500f34cd1b051ba990ea47b61f948.png)

`CHECK('Check State 3'),AT(396,91),USE(?CHECK1),STATE3('2')`

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