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Having tabs I want to draw a line on map and let it stay there all the time

I'm having some difficulty with drawing a line on a map. I'm basically drawing it etc. but when I select other tab and then come back to the "map tab" the line disappears. How can I prevent that so the line stays there all the time? Please开发者_Go百科 can someone help me to solve this?


Use an Overlay.

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