If you're using the action "Hookup Dialog Item" or "Hookup Standard Dialog Item", you can save it in a variable of type "Dialog Item" using the function "Last created dialog item". The function name is counterintuitive/misleading/wrong, but it works.
Yes, you can use "Hookup Dialog Item" for that.
Yes, if I understand you correctly.
If you're using the action "Hookup Dialog Item" or "Hookup Standard Dialog Item", you can save it in a variable of type "Dialog Item" using the function "Last created dialog item". The function name is counterintuitive/misleading/wrong, but it works.
http://peeeq.de/gui.php?id=3849