I see in the screenshot is not very clear.
I guess the reason is that the first element "Radio Button Group" in <On Change> was not Ancestor Reference.
You may make it in two ways:
1.Right-click <On Change> which in your "Radio Button Group", then choose Add Ancestor Reference then select its Ancestor Reference - "Radio Button Group". Then the project known this "Radio Button Group" was not another one, just the one which is parent of <On Change>.
2.(I just learn it from http://cn.tersus.com//#Id=4263 by Xuan Wu)
a. Copy the "Radio Button Group" which is parent of <On Change>. Paste - Reuse it in <On Change>. But until now the project didn't know it's the parent one, just seems a same structure one as the parent one. (It need a flow source to creat it.)
b. Right-Click the Reuse "Radio Button Group" in <On Change>, and choose "type" then select "Parent". Now your project know that this "Radio Button Group" was not another one, just the one which is parent of <On Change>.
The "Parent" element in a model has a blue box outside, and the "Intermediate" element has a black box which need a flow source to creat it.
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