Custom componet in mobile

I'm trying to create a custom component for the "Mobile Idea Page", specifically to replace the component "article" by default.

By eliminating the component "article" I have no access to variables as:

env.context.message.uniqueId , env.context.message.subject , etc.

Why the variables are out of scope when i delete the component in the page? and

how can I access the variable in a costum component?

thanks.