Object Scroll Upwards to a Defined Height and Stick

[Initiostar]

How best can I change 'stick on top' to scroll and stick at a height from the top of the page?



My workaround is to create a 100% transparent object, place it above the visible object, group the two and use stick on top. Has some odd side effects though; not sure about this in Xara, but maybe a 'style' with position: sticky; top 20px;?

Any suggestions how to do this correctly and smoothly welcome.

Thanks