How can I make the LineTooltipItem always appear above the Spot

** Don't make a duplicate issue.
Ok!

**Is your feature request relasted to a problem? Please describe.**
How do I make the LineTooltipItem appear above the Spot after clicking on it, and only disappear when I click on the empty space? By the way, I use GetX.

**Describe the solution you'd like**
Please give me a solution, with the detail code is better.

**Describe alternatives you've considered**
No.

**Additional context**
No.

The request concerns LineTooltipItem behavior after a Spot click and mentions GetX, but names no file, test, or entry point. Start by locating the line-chart tooltip and touch-handling documentation or examples, then define the expected persistence and dismissal behavior; done means a documented, reproducible solution.

Written by the indexing model from the issue text.