cannot create boxes vertically in passDialog plugin

Hii i'm using nsis scripting tool to create installers.For inputting serial numbers I use a plugin called pass dialog.But the problem with this plugin is it creates boxes that can be placed from left position only.But my requirement is to get 16 boxes each of which can be filled with 4 characters.I cannot create more than 5 boxes with current design.The code i'm using for creating boxes is given below

PassDialog:: Dialog Serial            \

                /HEADINGTEXT 'Please enter the serial code located on the software CD        case...' \

                /CENTER             \

                /BOXDASH 12  70 4 '' \

                /BOXDASH 92  70 4 ''  \

                /BOXDASH 172 70 4 ''   \

                /BOXDASH 252 70 4 ''    \

                /BOX     332  70 4 ''\

That plug-in is very old. You should use nsDialogs instead. If you need automatic box focusing you can use the nsKeyHook plug-in.

Stu