Create a template for the view of the multi-view widget designer 
The template contains the UI of the view. It is represented by an .ascx file built as an embedded resource. 
To create a template, perform the following:
    - Add an empty .ascx file to the project structure of the targeted widget.
    For example, you can place it under folder Resources/Views/ and, to match the name of the view, name it MultiViewWidgetDesignerView.ascx 
    - In the context menu of the .ascx file, click Properties.
 
    - In Properties pane set BuildAction field to EmbeddedResource.
 
    - Open the .ascx file and create the UI for the view.
 
Following is an example of a template that contains a single field for Title: