Menu item for each display_data in output area

[MRYingLEE]

I create a few charts with different display_id by code. Then I want to give an end user an option to save the selected chart as a file.

1. Is it possible to know which chart (display_id) is the selection by the mouse position?
2. If not, is it possible to create a menu item for each display_data dynamically under a popup menu item, "Save as file" for example? So end user can pick up by display_id.

Thanks,