Hi Michael,

Brilliant! Works perfectly.

>> I didn't try to do the additional text labels here, let me know if that would help you and I can give that a try too. <<

I'm not sure that labels are necessary. The user can see immediately what is the outcome of toggling (assuming that they have some experience in 3d modelling environments). However UI conventions would dictate that the 2 states of the button should be distinct. Could it be a simple as double underlining 3D to indicate Parallel Projection?



For now I'm happy how it is

Thanks again
James