I have a problem with the size of DropDown on high DPI. Long story short - it completely ignore DefaultItemsCountInDropDown and MaxDropDownItems.
Some DDL in our projects has fixed amount of items, and we set DefaultItemsCountInDropDown to fixed value, to avoid scrolls and empty space when possible.
And it works fine on 100% DPI. But when I change DPI settings in the system the pop-up height is greater than it should be and have empty space if DDL has less then 6 items. And It will show scrollbar if it has more then 6 items.
I believe that only DropDownHeight is used for scaling. By default, DefaultItemsCountInDropDown = 6 and DropDownHeight = 106, and on HDPI It looks like the program ignores DefaultItemsCountInDropDown and always uses DropDownHeight, which was automatically scaled for current dpi. To confirm my assumption, you can manually set DropDownHeight = 200 (for example) and the result will be the same on any DPI.
Below I gave examples of my code and screenshots from different DPI.
I use Telerik 2018.3.1016.20 with .Net 3.5
I very much rely on your help and advice.