BUTTON_CLICK
BUTTON_CLICK: "toolbar-button-click"
HIDE_OVERFLOW_MENU
HIDE_OVERFLOW_MENU: "hide-toolbar-overflow-menu"
HIDE_TOOLTIP
HIDE_TOOLTIP: "toolbar-hide-tooltip"
SHOW_OVERFLOW_MENU
SHOW_OVERFLOW_MENU: "show-toolbar-overflow-menu"
SHOW_TOOLTIP
SHOW_TOOLTIP: "toolbar-show-tooltip"
enum of all toolbar events