Transactions from Forms error

[koclukasz]

Hi,
I have a question if there is a way to deal with the approach that took previously to use the addon.

The structure of the project is like this. I have a IExternalApplication "Main" where idefine all the panels, buttons and the UI
In commands I am creating new instances of windows forms.
When I want to run some transactions i have to define ExternalEventsHandler and create ExternalEvents in "Main". However when I use AddinManager runing this form and trying to create the transaction, objects from "Main" are not found and I get Error "Object reference not set to an instance of an object"

Is there any way to resolve this without major changes in the code ?

[chuongmep]

Hi @koclukasz , do you have example that can reproduce the issues ? I believe it will easier for everyone to help.
Regards

[koclukasz]

Hi,
I have prepared a repository with only one command to show the issue.
https://github.com/koclukasz/Revit-Tools_Public
When I Load BeamReinforcementFormCommand opening BeamReinforcementForm i want to Raise a ExternalEvent declared in Main. However I get "Object reference not set to an instance of an object" Exception like ExternalEvent wasnt declared thus i assume Main is not run.
Regards,
Lukasz