4 Answers, 1 is accepted
I think I see a part of my problem. The phrase I'm looking for has spaces. So when I get to the third word, the control jumps to the beginning letter of the third word.
If I only type in the first two words, the drop down does NOT jump to the matching word. If I type in a single word that appears towards the top of the list, it seems to work.
I don't think this release was tested for every day uses.
I will address each question you have raised in the order they were posted.
On duplicated items - if the information in the other threads (here and here) does not help you resolve this, I advise that you open a support ticket and send us the details - actual markup and code-behind of the combo box, together with some dummy data so we can run and debug this. You can also use the sample data sources from our demos to power such a sample.
On virtual scrolling not working - what I can see in the provided screenshot is that the required properties (Height and MaxHeight) are not set and Virtual Scrolling requires them. Since this works with the ItemsRequested event, you must use the information from the control (text, items offset, etc.) to prepare the items you want added.
Upgrade being needed - if the problematic project uses a very old version of our controls, it is likely that bugs you hit will be fixed in newer versions (you can read more about this here). You have a valid license which means that you already have access to the latest version and to our support system.
Filtering not working - the provided information is insufficient to determine what is the problem and I encourage you to open a ticket if you still need help with this.
Lack of response - we guarantee a 24 hour response in private support tickets. This is a forum thread and while we do monitor the forums, we do not guarantee responses here. With this, I would encourage you again to open support tickets when you have such issues so you can get the best assistance possible in a timely manner.