There are some issues with debugger tooltips:
1) Tooltips for global variables (primitive types) appear only once.
2) Tooltips for global structures are not expandable (
3) After restart debugger, tooltips for global variables do not work at all,
and there is an issue with expanding local structures.
I found the way to resolve all these issues, but I'm not sure this way is proper.
Tested only with GDB Engine.