Hi,

I am getting a very odd thing happening with my treeview control. When I 
expand/collapse a node using the mouse there is no problem, both on the 
double-click and using the '+'. When I use the enter key on the same node 
to expand/collapse an error beep is generated. I have set 'Break on all 
errors', and have also stepped through the code. Nothing. It only happens 
when I am in run mode. I have also tried commenting out all code behind 
all events to do with the treeview and have ensured that the 
Form.KeyPreview is false, all to no avail.

Does anyone know what may lead to this sort of behaviour.

Thanks,
Brett