Compatibility for Trainer Units

diff --git a/binaries/data/mods/public/gui/structree/draw.js b/binaries/data/mods/public/gui/structree/draw.js
index 1fbd677..df48736 100644
--- a/binaries/data/mods/public/gui/structree/draw.js
+++ b/binaries/data/mods/public/gui/structree/draw.js
@@ -136,7 +136,10 @@ function draw()
                    prod = g_ParsedData.units[prod];
                    break;
                case "techs":
-                   prod = g_ParsedData.techs[prod];
+                   prod = clone(g_ParsedData.techs[prod]);
+                   for (let res in trainer.techCostMultiplier)
+                       if (prod.cost[res])
+                           prod.cost[res] *= trainer.techCostMultiplier[res];
                    break;
                default:
                    continue;