Create a DelegateProperty and begin replacing
Refactor for separation of combobox/property
Refactor typable combobox and allow in speakers' list selection
Redesign speakers' list panel
Redesign speakers' list panel to use context menu

This saves valuable screen real estate by removing
buttons that are seldom used and putting them into
a right-click menu.
Give high-resolution icon to public panel
Externalize and localize recent changes