public void RemoveContentController(ContentTypeController controller)
{
controller.ContentOpened -= ControllerContentOpenedHandler;
controller.ContentClosed -= ControllerContentClosedHandler;
_contentControllers.Remove(controller);
}
public void AddContentController(ContentTypeController controller)
{
controller.ContentOpened += ControllerContentOpenedHandler;
controller.ContentClosed += ControllerContentClosedHandler;
_contentControllers.Add(controller);
}