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Check box undefined for check box group field

I have a group box, I want to link the box "Group box with the theme" Groupbox checkbox The theme image is an example.

How to connect Theme1 and Theme2 with themes? Checkbox controlled by Example groupbox

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You did not specify what “binding topics to a group box” means and what an undefined state means. However, since checking / selecting Theme1 probably precludes the use of Theme2 , it looks like you are not using the correct user interface representation (since the user can select both).

Consider a ComboBox with the entries {"No Theme", "Theme 1", "Theme 2"} . Thus, no one gets confused and less form space is consumed.

Edit

If your edit really reflects what you want, set the “external” check state whenever one of the checkbox's internal checks changes. This still does not make sense - what will you do when the user checks / deselects the external flag?

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