Is it possibile to create a custom manager such as the "ImportManager"?

Hello all,

I need to create a dialog to import files from another system through D2 UI.

I tried to create a custom manager class like ImportManager and replace the 1st dialog with a custom one to make users can select infos (from registered table) to import.

users need to edit properties for each item and that's why I consider a custom manager.

I added a menu and call action "Show dialog with manager : CustomImportManager", but

"The class CustomImportManager

is unknown in the factory ActionManagerFactoryImpl" message shows up on browser console and nothing happens.

Is it possible to add a custom manager on D2?

If not, Is there any alternatives to cover this requirement?

Any information you provide would be really helpful for me.

Thanks.