Neu Plugin updates (Want to display modal on plugin update button click event)

[joy007]

Hello,
I want to display popup modal like "jtl_pop_modal.png" on plugin update button click event refer "jtl_plugin_update_button_option.png", but currently I am getting javascript confirm alert box with the message "Wollen Sie das Plugin wirklich updaten?". How can display the pop modal message on the plugin update button click event instead of javascript confirm alert box message without any core file changes?

Note: I am able to display the pop modal when I am selecting plugin check box under "Verfügbar" tab.