fixedup ItemPickers, PersonPicker, and GeoPicker so they do not do a PostBack if there isn't an Event assigned.  Switch the buttons from LinkButton (always does a postback) to HtmlAnchor (only does a postback if there is an ServerClick assigned).  This improves performance of these controls and also fixes an issue when the pickers are used in Modals
fixed up the Grid Add and Delete buttons so they still do Async postback even if the Grid is created at runtime (like in Checkin Config)