I have figured out that Syncfusion SfRadialMenu is still stealing touch events, even if its closed.
It means that all controls that are above or underneath of SfRadialMenu won't get touch events if they are overlapping.
I have an option that users can edit position of buttons in my program, so they can put buttons just above/under SfRadialMenu, so when it is closed i would like to get those touch events. I can guess that SfRadialMenu is implementing OnInterceptTouchEvent and simply always return 'true' there so Android is simply thinking that all events on this area should be passed to SfRadialMenu and is not asking any other control for that, doesnt matter if its above or underneath SfRadialMenu. It would be good to check if event is inside center button if menu is closed and if not return 'false' and do not steal touch events in this situation. Returning always true in OnInterceptTouchEvent is breaking default Android controls touch behaviour that controls above other controls will awlays get touch event first and controls underneath will got it only if a control above will return false in OnTouch method, so On
If anyone has the same problem, i have a workaround for that. I have made an OnInterceptTouchEvent on parent layout, and simply i am stealing all touch events and manually passing them to controls if its in SfRadialMenu area, before it will steal it.