Documentation 21.2: DevExtreme - JavaScript Data Grid Toolbar
DevExtreme - New Drop Down Button (v19.1)
GitHub - DevExpress-Examples/getting-started-with-devextreme-selectbox: Stores the source code for the Getting Started with DevExtreme SelectBox tutorial.
How to: Customize the Checked Filter Dropdown List | WinForms Controls | DevExpress Documentation
Filter and Search | WinForms Controls | DevExpress Documentation