Good question, but you should answer that. 
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please tell me what is the problem.
I've tried my extension using Companion and it's working 
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As I always say, provide a precise description and a test aia.
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Or you should mention that this has to be set in the Designer:
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okay now I want to know why this problem arises @Anke
https://community.appinventor.mit.edu/uploads/default/original/3X/b/b/bb38a230b9a0532eaab2405dd8f554d790d7257b.png
I don't need this aia anymore. It's about explaining it to other users and not letting any questions or misunderstandings arise.
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okay then aia can be for other people who want to know how my extensions work
So again: Add a description and point out possible problems (like those discussed here).
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How do you assign different texts (with format) to different components, it seems you can only assign one text to all registered components ?
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I am now very confused, and I don't understand what you mean.
I think you should see how my project works @TIMAI2
As you can see, even two PowerUser have problems how exactly the extension should work. So for the third time: Provide a precise description (not only by posting my blocks there).
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OK, thanks Anke, seems you register a component each time, after setting the text, and this doesn't change the text in other components 
use a procedure like the one I created in my aia project
I believe you should explain how your extension works. It should be clear from the description and the examples you provide, without the need to setup a project and test the extension myself.
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