Widget with a List Property

I am working on trying to create a custom slider widget to add to my home page.  This would require the designer part of the widget to allow for the user to dynamically add and remove slides.  And then map them to a list of slider objects for displaying.  

I noticed that the controls in the designer were mapped to the appropriate property, so I wasn't sure exactly what the appropriate control was to use or if there is another way to do what I need it to do.

Thanks for your help.