We work on a product that features a large set of input components that are based on the Kendo inputs and dropdowns. We have custom designs that require us to customize the Popups of comboboxes, multi-selects, color pickers, etc with specific layout and styling, open/close animations, blur handling and keyboard interactions (e.g. closing on Esc). This is done fairly easy with the Date Input components (DatePicker, DateTimePicker, DateRangePicker, TimePicker) as they expose such property:
However most other controls that use a Popup internally expose just PopupSettings that is not enough for us even with the "appendTo" option.
We would be happy to see a similar ability (as in Date Inputs) to inject the Popup component in:
I guess that customizing the popup in the DropDownButton, FloatingActionButton and SplitButton would also be nice to have but for those CSS styling does good enough job for us.