Sergiy,

thank you very much for your quick reply.
No luck to get it work. My OS is Windows 2000.
Your original example version works fine.
The only differences is my main form (renamed as frmMain) is much more complicate than yours.

By the way, can you bring up the "More options..." screen of the route planner by using the similar method. I'd like to bring up the screen just by clicking a button, but not on the route planner screen.

Thanks again,

David