How to add a button to a pre-existing tab on ribbon (C#)?

Question

I\'ve successfully created a new tab and put it next to the pre-existing ones. Then I realized that I\'ll only have one button on it, so it makes more sense (for now) to put it

Answer 1

Edited. Sorry, gave a dnn link. You want office and you want c#.

Here's a StackOverflow answer in VBA... How to get Ribbon custom Tabs IDs?

AccessibleChildren _
            Lib "oleacc.dll" _
                (ByVal paccContainer As Object, _
                 ByVal iChildStart As Long, _
                 ByVal cChildren As Long, _
                       rgvarChildren As Variant, _
                       pcObtained As Long) _
            As Long

Which in C# translates to

[Lib "oleacc.dll"]
Long AccessibleChildren(object paccContainer, 
                        long iChildStart, 
                        long cChildren, 
                        object rgvarChildren, 
                        long pcObtained)...

I never tried it, so not sure it works.

From all other documentation, it seems you simply get the ribbon object, and in it iterate (with foreach) through all the children