How I can delete items from an Image list

Hello,

I starting with the creation of a demo app this week.
No I have one open issue/problem.
I want delete entries from my created list. (I use a client-side-store for my prototype).
Please see more information to the issue/problem in the enclosed document.

Problem description.docx (370.3 KB)

Would be great if somebody can help me.
thanks in advance.

Kind regards
Martin