What steps will reproduce the problem?
1. Load TomTom and FlightHUD
2. Try and add a TomTom waypoint on the world map

What is the expected output? What do you see instead?
I expect a TomTom waypoint to appear, but it doesn't- the map zooms out instead.

What version of the product are you using?
v0.7.19

Do you have an error log of what happened?
No error occurs

Please provide any additional information below.
Your hooking of the the WorldMapButton is not quite right, and fails to respect other people's (e.g. TomTom's) further hooking of the WorldMapButton, so the TomTom stuff is ignored in the case it loads after FlightHUD.

Attached is a patch that appears to fix the problem for me.

Hope this helps