creating a other topic in rviz display plugin

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Hey, i created a new Display Plugin for Rviz but i wanted to to create an other topic to return some information. Because i have no argv and argc arguments i cant do ros::init ... and if i just create a new ros::NodeHandle this works sometimes fine ... but i guess if nothing is displayed it stops on ros::spineOnce() is this normal or is the problem somewhere else in my code?

so the main question is what is the right way to create a new Topic in a rviz display plugin?