I often get the remark from users that they are "missing a tab". When I point out the scroll arrows the reaction usually is any variation of "oh, I haven't noticed!" The arrows don't really stand out, and it's escpecialy hard to notice when some tabs are out of the visible part (one of the arrows just colors black). Even when users know there are more tabs the the one visible on screen, they tend to forget about them after a while (*sigh*... users ;-) ).
Therefore I think it would be great to use multi-line tabs. When there are more tabs than can fit in the width of the PageControl, they "overflow" to a second line. More or less like word wrapping. You can get this behaviour in Delphi if you have GExperts installed and enable the "multiline tabs" option.
This way users have all the tabs visible at all times, and you only use the height of one line of tabs of usable form space. I think this is a very usefull feature which is more intuitive for users, and you will get less questions
As an intermediate solution it would be nice if you could use your own bitmaps for the buttons so you can make them stand out more and make it easyier to see.
Regards,
Stijn.











