How to use FSlateApplication? (inherit or?)

How should i use FSlateApplication, to create my application?

Should i use FSlateApplication static functions?

or i should inherit FMyApplication : public FSlateApplication?

Where should i create Tick function for my application? is there any interface to pass somewhere?

Check out SlateViewer program code that comes with Engine source.
You should be able to create your own program that uses standalone renderer based on SlateViewer project.

44542-slateviewetr.png

i suppose this is the only way.