action_bar.go
func (bar *ActionBar) RegisterAction(action ActionInterface) {
	bar.GlobalActions = append(bar.GlobalActions, action)
	bar.actions = bar.GlobalActions
}
func (bar *ActionBar) RegisterAction(action ActionInterface) {
	bar.GlobalActions = append(bar.GlobalActions, action)
	bar.actions = bar.GlobalActions
}
// RegisterAction register global action