how i can inherit and modify this tiny modal view - the popup - (ref screenshot) it opened when click on a date in Red box, open it and on bug button it is showing in menu 'Edit View: Actity' and i don't know what Model or what View is using here.
the idea is to add a Date picker and when user pick a date and press Done it should completely mark Done this scheduled Activity from here, no further need to edit and Mark as Done.
regards