Hi Community, 

i am working on the change of our javascript buttons so that we can use it in lightning.
Regarding to the readiness report i started to check each custom button which are not supported.
I noticed that some javascript button partically work in lightning.
The Recommendations of the readiness report are that lightning component should be used for this case. The javascript buttons which are partically work in lightning, opens an default/automatic generated windows  (e.g. button create a new opportunity out of contact) this window has the correct fields which i needed.
My question is where is this default window with the correct fields stored, can i copy the structure of it to build a lightning component?

Best regards

Hakan