I would not use the Wait function here. Use a Event Structure.
Create an event structure and place this inside your while loop overtop of the stuff you already have. Place the Tree String outside of the while loop but do not waire it to anything. Create a Tree Control Reference (right click on the Tree String and choose Create > Reference) and place this outside of your while loop. Wire the reference to the while loop then into the Event Structure. Create seperate cases for the stop and double click events so your not pooling and taking up CPU resources. Then, inside the double click event, create a strict tree method node by right clicking on the green wire and select Create > Method > Double Click.
