The RadEntry control has IsSpellCheckEnabled property. Disable the spell check by default for the RadComboBox control

I want to achieve the dropdown size dynamically based on the item count. I would also like to set a maximum height, so if more items are loaded, the dropdown should be scrolled to that size.

It would be nice to have the ability to select different item in the dropdown by keyboard up/down arrows.

This feature probably does not make sense on mobile platforms, but it would be great on desktop platforms.

When is edit mode, provide support for closing the drop-down when enter key is pressed

We would like to be able to override the behavior of the Clear button in the editable combo box.

When the user has started typing into an editable combo box, and they click the Clear button before they've selected another item, we want to revert their text to what was in there before they started typing and keep the previously selected item selected, rather than clearing the text and selected item.

If you can add that functionality, even better, but it should be enough to just expose the Clear button's Click event (with a Cancel param or another way to ensure the text isn't cleared), so we can override the current functionality.

Provide an option to modify the ComboBox so there is no space between the ComboBox and the dropdown.

I have a Combobox that I want the width of the dropdown to be larger than the input text width.