[quote=159169:@Richard Summers]Sam,
when I use your code above - my app still compiles and runs - but there is no change??
Are you sure 8192 is the correct number?
Thanks.[/quote]
You must set Window Type to Floating Window
Thanks Axel - I will try that 
Shame a listbox has the default gray scrollbars, otherwise I could make my apps with the black window chrome 
[quote=159238:@Richard Summers]Thanks Axel - I will try that
Shame a listbox has the default gray scrollbars, otherwise I could make my apps with the black window chrome :([/quote]
You have black scrollbars in https://forum.xojo.com/10914-black-windows
Just set the listbox with no scrollbar in the inspector, add the black scrollbar, then use scrollposition to link it to the listbox.