Lock checkbuttons

If you need a uniform size change in two or all three dimensions you can use lock checkbuttons at the right of the size dimensions. When lock is on the dimensions that are locked will be changed saving their aspect ratio.

Preserve UV

When object size changes UV mapping usually breaks. Preserve UV option allows to save UV mapping during size transformation. This option uses the standard 3ds Max Preserve UVs function of Editable Poly.