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.