Hello people, I'm making a Practical Work in Pharo with my classmates, the Work should be a fully working application to manage a University Library. At the moment we have most of the work done, I must say it's messy and far from being beautiful, but it works and it's likely to be approved. Here is what's done so far: https://github.com/arguser/Paradigmas-Final

Most of the work was doing making research and guided mostly y examples, so far I didn't find how to do or make work some features:
* A Dialog which prompts for User and Password (We don't know how to implement it in-code either)
* Block a father window when a child is made, so the father window can't be closed if a child window exist.
* Make some content of windows change size dynamically.
* Search only for filled-in fields from search form.

If any advice or example can be given addressing the previous matters it will be really helpful.

Thanks in advance!