# Breaking change with CheckButtonWidgetAnnotation

**URL:** <https://pdfjs.community/t/breaking-change-with-checkbuttonwidgetannotation/1644>\
**Category:** Technical Support\
**Created:** [April 29, 2022, 1:14am UTC](https://pdfjs.community/t/breaking-change-with-checkbuttonwidgetannotation/1644 "2022-04-29T01:14:57Z")\
**Posts on this page:** 1\
**Showing post:** 3

<div class="post-metadata">

**Author:** ![system](https://canada1.discourse-cdn.com/flex031/uploads/pdfjscommunity/original/1X/ffbcd25c7d423db8d5acd5db201c272f4db306dd.png) [@system](https://pdfjs.community/u/system)\
**Post date:** [April 29, 2022, 1:15am UTC](https://pdfjs.community/t/breaking-change-with-checkbuttonwidgetannotation/1644/3 "2022-04-29T01:15:02Z")

</div>

**Hello, I’m Ron, an automated tech support bot 🤖**

While you wait for one of our customer support representatives to get back to you, please check out some of these documentation pages:

Guides:
- [Customize form field styles](https://pdfjs.express/documentation/forms/styling-form-fields)
- [Understand coordinates in PDF.js Express - In practice](https://pdfjs.express/documentation/viewer/coordinates.8#in-practice)
- [Default UI for WebViewer - How it works behind the scenes](https://pdfjs.express/documentation/ui-customization/default-ui#how-it-works-behind-the-scenes)

APIs:
- [UI.Hotkeys - on(key [, handler])](https://pdfjs.express/api/UI.Hotkeys.html#.on__anchor)
- [UI.MenuOverlay - update( [items])](https://pdfjs.express/api/UI.MenuOverlay.html#update__anchor)
- [UndefinedgetInstance( [element])](https://pdfjs.express/api/global.html#getInstance__anchor)

Forums:
- [Annotation Prototype getting wrong “this” in some cases](https://pdfjs.community/t/annotation-prototype-getting-wrong-this-in-some-cases/1222/1)
- [Disable annotation grouping, rotating and resizing / feature disabling issues](https://pdfjs.community/t/disable-annotation-grouping-rotating-and-resizing-feature-disabling-issues/1550/1)
- [After upgrading from Pdfjs 7.1.2 to 7.3.0, setCustomDrawHandler is creating problem as ‘Invalid Pdf Structure’](https://pdfjs.community/t/after-upgrading-from-pdfjs-7-1-2-to-7-3-0-setcustomdrawhandler-is-creating-problem-as-invalid-pdf-structure/553/1)

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_[View the full topic](https://pdfjs.community/t/breaking-change-with-checkbuttonwidgetannotation/1644)._