BOX_CLICK
BOX_CLICK: "box-click"
BOX_MOUSEMOVE
BOX_MOUSEMOVE: "box-mousemove"
BOX_MOUSEOUT
BOX_MOUSEOUT: "box-mouseout"
BOX_MOUSEOVER
BOX_MOUSEOVER: "box-mouseover"
OUTLIER_CLICK
OUTLIER_CLICK: "outlier-click"
OUTLIER_MOUSEMOVE
OUTLIER_MOUSEMOVE: "outlier-mousemove"
OUTLIER_MOUSEOUT
OUTLIER_MOUSEOUT: "outlier-mouseout"
OUTLIER_MOUSEOVER
OUTLIER_MOUSEOVER: "outlier-mouseover"
enum of all boxplot graph events