- whenever a trendline (or an horizontal line) is created, a button should appear next to it
- if the trendline (or horizontal line) is moved by the user, the button should follow
- if the button is clicked it should show an alert with the name of the trendline
- if the trendline is deleted, the button should also be deleted
- it should not import dll's
- it should be light weight (not cpu intensive).