There was an issue with wheel view related to the scrolling functionality. It did not work if wheel is placed inside a ScrollView.
I've investigated standard controls and found a one that does work alike (multiline EditText) and a one working as expected (SeekBar). I would like to check also ScrollView inside a ScrollView, but fortunately I did find a solution for this issue only by using SeekBar sources from Android SDK (I have old ones, but it was enough).
The main problem was with WheelView.onTouchEvent() - it did not receive all touch events because they were processed by parent (scroll view). So it needed to ask the ScrollView to skip touch events and allow the wheel to perform them by onTouchEvent(). There is a corresponding method for a parent view called ViewParent.requestDisallowInterceptTouchEvent(). SeekBar calls it during handling the ACTION_MOVE touch event action. I've added this approach to the wheel view and it works too! :)
I'm unable to commit this fix now because of working on custom views for wheel items; will do that later. So please fix your code manually. Thanks!