Why can't I open Screen2 in the end?
Use the ShowChooseDialog method to trigger the AfterChoosing event
Taifun
If I want different responses based on different choices, how can I achieve that? There is no such thing as "if button 1 is selected" here.
Different responses means different button texts on the notification? Please elaborate
Taifun
oh! I already know how to "get choice", thanks for your help.
Let me recommend to do some tutorials to learn the bashcs
A very good way to learn App Inventor is to read the free Inventor's Manual here in the AI2 free online eBook App Inventor 2 Book: Create Your Own Android Apps ... the links are at the bottom of the Web page. The book 'teaches' users how to program with AI2 blocks.
There is a free programming course here http://www.appinventor.org/content/CourseInABox/Intro and the aia files for the projects in the book are here: App Inventor 2 Book: Create Your Own Android Apps
How to do a lot of basic things with App Inventor are described here: How do you...? .
Also do the tutorials Our Tutorials! to learn the basics of App Inventor, then try something and follow the Top 5 Tips: How to learn App Inventor
Taifun
Trying to push the limits! Snippets, Tutorials and Extensions from Pura Vida Apps by 
Taifun.
The Alt Notifier extension provides the functionality (an event block) for the message dialog you are attempting.
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