VLEXAMPLE - BASIC 2 vlex="cx:{$cX};cy:{$cY};r:{min($y/4,$x/4)}" - the gray circle should be centered at stage - its diameter should be half of stage´s minor dimesion 
                VLEXAMPLE - BASIC 2

                vlex="cx:{$cX};cy:{$cY};r:{min($y/4,$x/4)}"

                - the gray circle should be centered at stage
                - its diameter should be half of stage´s minor dimesion