code: func NewCustom(title string) *Panel {
  	if title == "" {
  		title = "Panel Title"
  	}
  	render := "flot"
  	return &Panel{
  		commonPanel: commonPanel{
  			OfType:   CustomType,
  			Title:    title,
  			Type:     "singlestat",
  			Renderer: &render,
  			IsNew:    true},
  		CustomPanel: &CustomPanel{}}
  }
docs: // NewCustom initializes panel with a singlestat panel.