Zoom associated with a slide control

I have a slider that updates an integer variable that varies from -200 to 200 and i need to update the zoom of the diagram accordingly with that value (negative values means zoom out and positive values means zoom in)!
Can someone help me with this issue? Thanks in advance!

Look at the Slider used in the Org Chart (static) sample.
You’ll want to use a different Converter.

Thanks Walter!