I'm doing a simple project that can

I'm doing a simple project that can trace user's positions and plot these locations using Polyline. Now I want to add a check box to toggle whether to display these lines or not. The challenge I think is that I have many polylines here so I don't know how to set all of them invisible/visible at the same time.

Kết quả (Anh) 2:

I'm doing a simple project can trace user's có positions and locations using Polyline những plot. Now I want to add a check box to toggle to display nếu những lines or not. The challenge I think is That I have many polylines here than I do not know how to set all of add invisible / visible at the same time.