Why is Mask Editor self-modification checkbox disabled?

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I have been trying to work through the Create a Custom Block example/tutorial, using MATLAB/Simulink R2016b. In the second part, on creating a dialog to configure the custom block by creating a mask, when I reach the third pane ("Initialization") of the Mask Editor, I am supposed to mark the "Allow library block to modify its contents" checkbox. But the checkbox is disabled (i.e., greyed out). Why is the checkbox disabled? What can I do about this? Thanks.

Answers (1)

Himanshu Tripathi
Himanshu Tripathi on 7 Jun 2019
This check box is enabled only if the masked block resides in a library.
Make sure you are putting your masked block in a library.

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