howto create template with previewable notitation?

Hi,
I want to create my own .vst template that can reused by others.
It's fine for create one however, when open new drawing .
the template's preview diagram is empty... Square and empty.

I know if I chose to save the .vst file with a default page (for preview
used), contains some diagram.
then the preview can see just like the default page.

but tihs is not what I need, since when use the template, the preview used
default page will also show out. I really dont need this.

any ideals ?

help me again. thanks