To Antonio and All : How insert a scroll in a class

[Silvio]

I made a graphics class
With it you can insert on a box 50x100 many bitmaps

I use it for create configuration of a beach ( umbrellas..) or configuration of tables of a Room Restaurant.
I want insert a vertical and a horizontal scrollbar but I not Know How I can insert it
On picture you can see scrollbar beacause I use style wsscroll but it not run ok
Someone can help me please