ZBrushCentral

[MatCap] How to "Render to texture" in 3.5r3?

I’m not joking, how do you render a 2D image in ZBrush 3.5? I never render in ZB cause I only use it for normal map/polypaint solely.
I watched a MatCap Baking tutorial in ZClassroom. The video use 3.1 but now I switched to 3.5r3. After overcoming the displacement/texture process, I stuck.

How to render a texture, base on the object current screen, and specify a size ,said 2048*2048?

I’m sorry that my English really suck, so an attachment maybe a better presentation:
How to “Render” the ZTool in the attachment, so that it become a 2048*2048 jpg texture?

Attachments

1.jpg