Changes for easier testing of themes:   - change ComboBox --> !FilteringSelect, to be able to test display of validation icon   - added a few placeHolders (hint strings), specifically to !DateTextBox and !FilteringSelect   - add dialog with action bar (only currently working for Claro)   - add dialog with loading animation (that happens every time the dialog is opened)   - added "Dialogs" !MenuBar item to make it easier to display Dialogs
Changes for easier testing of themes:
  - change ComboBox --> !FilteringSelect, to be able to test display of validation icon
  - added a few placeHolders (hint strings), specifically to !DateTextBox and !FilteringSelect
  - add dialog with action bar (only currently working for Claro)
  - add dialog with loading animation (that happens every time the dialog is opened)
  - added "Dialogs" !MenuBar item to make it easier to display Dialogs

Refs #10527, #3286, #11034.

git-svn-id: 674a2d6b1e32e53f607eb824547723f32280967e@22043 560b804f-0ae3-0310-86f3-f6aa0a117693

redaktor/deliteful