[SOLVED] How to render only a region/tile for VFB picture viewer?

[kraphik3d]

I have interior visuals with corona and sometimes I need to change some details.
Now it takes much time to render whole image with all lighting and furniture. Is it possible to only render
region to VFB / Picture viewer ?

Similar to this

[beanzvision]

Click the region button and then draw your area to render.

[kraphik3d]

thanks!