ToolTips ：How to keep tooltips display when I move my mouse?

Hello all,

I need to view the details in my Tooltip (there is a lot of content), so when the Tooltip is displayed, I want to pull it down, but when I move my mouse out of the current diagram, the Tooltip disappears.

I made a simple example，when I want to move my mouse over the Tooltip, it disappears immediatly ,do you have any idea to solve that?
 

Thanks.