Add button to simplify panel 2015

[Arnold82]

Hello,

I have an addin that adds a button to the 'Assemble' tab in an assembly:

Dim ribbon As Inventor.Ribbon = uiMan.Ribbons("Assembly")
Dim tab As Inventor.RibbonTab = ribbon.RibbonTabs("id_TabAssemble")

This works fine in any inventor version.

Now I was asked to move this button to the 'Simplify' tab for 2015.

I've gathered internalnames of all tabs in the assembly ribbon in a textfile

Tabs (internal name)

id_TabAssemble

Simplification:AssemblyTab

id_TabDesign

id_TabModel

id_TabSketch

id_TabWeld

etc

The problem is that if I change ribbon tab name from "id_TabAssemble" to "Simplification:AssemblyTab" I get an error.

What am I doing wrong?

Another question, the simplify tab has 2 panels according to my textfile:

Simplification:AssemblyTab
   Simplification:AssemblySimplifyPanel      {71019C12-43F6-4C11-BA7A-AD9BDBC5EA0C}
   Simplification:AssemblyModifyPanel      {71019C12-43F6-4C11-BA7A-AD9BDBC5EA0C}

But I only see one in Inventor, which one is that?

[Arnold82]

Anyone from autodesk who can help me?

I get an error when I change:

Dim tab As Inventor.RibbonTab = ribbon.RibbonTabs("id_TabAssemble")

to

Dim tab As Inventor.RibbonTab = ribbon.RibbonTabs("Simplification:AssemblyTab")