Resize and font change for VaTerminal

I would like to resize and change fonts to VaTerminal component (I'm doing something similar to famous TeraTerm).

What is the best way to do it ? I try to update Width and Height but doesn't work; now I update Columns and Rows, and for resize work well, but when change fonts I still have some probelm.

Any suggestion ?

Best reards
Ing Giuseppe Monteleone