Open
eventsFired before the sources popover opens. Calling e.preventDefault() prevents the popover from being shown.
The event handler function context (available via the this keyword) will be set to the widget instance.
Event Data
e.sources Array
The current sources array configured on the widget.
e.preventDefault Function
If invoked, prevents the popover from opening.
e.sender kendo.ui.Citation
The widget instance which fired the event.