I am trying to create an interactive calculator using IBM VisualAge. Anyone got some tips on how I can accomplish this please? In particular:

1/ How I can ensure that where required, an active panel appears in front of one that isn't in use. For example, I have a two panels - one for password input and the other to display my results. As such, after entering my correct password in the first panel, it disappears behind the second panel in order to enable it display my input/results?

2/ How can I ensure that my calculator will accept multi-digit entries. Example, if I enter 2 + 3, how can I ensure the calculator remembers my first digit and add it to the second?

3/ How can I manipulate the applet title bar to display some specific text?

4/ Any other tips welcome