added callback handler for clicking on connchurn bars (closes #84).
added callback handler for clicking on connchurn bars (closes #84).

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