Multiple Inventor buttons greyed out because of my addin

[Jaapflonk1]

Multiple buttons like Stress Analysis and Dynamic Simulation are greyed out whenever my addin is loaded in.

When i turn of my addin these buttons are not greyed out anymore.

My addin adds a bunch automatization tools to Inventor.

I do not do touch any of these greyed out buttons with my addin or do anything with their functionality.

Anybody have an idea what can cause this and how i can fix it?

[bradeneuropeArthur]

can you upload the code, otherwise it is hard to find out why!

When Stress Analysis and Dynamic Simulation are greyed out in Autodesk Inventor, it usually means the environment isn't fully enabled or something's blocking access. Here's a breakdown of what might be going on and how to fix it:
1. Check Add-Ins Are Loaded
- Go to Tools → Add-Ins
- Make sure Stress Analysis, Dynamic Simulation, and related environments are set to Loaded and Load Automatically
- If they’re already loaded and still greyed out, continue below
2. You're Not in the Right Environment
- These tools only work in Assembly or Part environments, depending on the feature
- For example, Stress Analysis requires a part or assembly file to be open and active
- If you're in a Presentation or Drawing file, the buttons will be disabled
3. Simulation Player Is Active
- If you’ve previously run a simulation, the Simulation Player might still be active
- Click Rewind or Return to Construction Mode in the Simulation Player to unlock editing tools

[Jaapflonk1]

Sadly i can not share the code.

1. Addins are all loaded

2. I am in the right environment

3. Simulation player is not in use

As soon as i turn off my addin and restart Inventor all buttons work again.

[Jaapflonk1]

I have solved the issue but i still don't really understand why this happens.

I added added this event in my AddinServer:

Inv.App.UserInterfaceManager.UserInterfaceEvents.OnEnvironmentChange += UserInterfaceEvents_OnEnvironmentChange;


private void UserInterfaceEvents_OnEnvironmentChange(Inventor.Environment Environment, EnvironmentStateEnum EnvironmentState, EventTimingEnum BeforeOrAfter, NameValueMap Context, out HandlingCodeEnum HandlingCode)
{


HandlingCode = HandlingCodeEnum.kEventHandled;
}

The event works, but it causes the Stress Analysis and the other buttons to be greyed out.

This seems like a bug to me.

[g.georgiades · Accepted solution]

The simulation environments are actually addins in inventor. 

Many addins are using that event handler. Because you have

HandlingCode = HandlingCodeEnum.kEventHandled;

 I believe it is preventing the other event consumers from running. Try removing just that line and see if the buttons show up.

There is some context in the docs about handling codes https://help.autodesk.com/view/INVNTOR/2025/ENU/?guid=HandlingCodeEnum

In web terms, that line stops the event from propogating to other consumers.

Likely it means your addin is probably loading before the simulation addins.

[Jaapflonk1]

That line seems to be mandatory. 

However changing it to kEventNotHandled does solve the problem.

Thanks!

[g.georgiades]

I suppose some event handlers require the handling code to be set and some do not.

I know App Events usually do not require it.