On 17/11/2017 at 08:07, xxxxxxxx wrote:
There's a fundamental difference between messages (i.e. send and received via Message() in NodeData derived entities) and core messages (send by SpecialEventAdd() and received in CoreMessage() of for example a MessageData).
The first ones are synchronous messages, so the code is executed directly, when Message() is called. If it's called in a threaded context, the receiving side is executing in the same thread context.
Core messages (also event messages) are asynchronous, they get queued and will be received in CoreMessage() in the main thread.
See also the NodeData::Message() manual and the Core Messages manual.
In order to do you initialization work, you may want to look into MSG_MENUPREPARE (also NodeData::Message() - Creation manual), which will be send, when the user creates the tag. When received the tag is already inserted into the object.
And then later on messages like MSG_POINTS_CHANGED or MSG_POLYGONS_CHANGED may help to keep track. These will also be send, if the user moves the tag to another object (even if point/polygon count stay the same).