fixed a bug with event type plots.
fixed a bug with event type plots.

devkev/mtools,parkhyeonghwa/mtools,aerrami/mtools,corymintz/mtools,corymintz/mtools,parkhyeonghwa/mtools,aerrami/mtools,rueckstiess/mtools,gormanb/mtools,ces0712/mtools,yaowenqiang/mtools,gormanb/mtools,yaowenqiang/mtools,yaowenqiang/mtools,ces0712/mtools,corymintz/mtools,ces0712/mtools,tomzhang/mtools,devkev/mtools,parkhyeonghwa/mtools,tomzhang/mtools,devkev/mtools,rueckstiess/mtools,aerrami/mtools,tomzhang/mtools,gormanb/mtools