MOUSE_MOVE event works outside chosen element

I’m working on measure tool which makes measurements on different maps simultaneously on fly. To do so I’ve declared ScreenSpaceEventHandler and selected element as in docs. The issue I’m facing is that MOUSE_MOVE type triggers even if mouse is outside selected element but other types doesn’t. I’m wondering is this is some kind of bug? If not, it is possible to force other event types to work this way?