optimize widget destruction

modules/core_lib/ui/radiogroup.lua

@@ -7,9 +7,10 @@ function RadioGroup.create()
 end
 
 function RadioGroup:destroy()
-  while #self.widgets ~= 0 do
-    self:removeWidget(self.widgets[1])
+  for k,widget in pairs(self.widgets) do
+    widget.onMousePress = nil
   end
+  self.widgets = {}
 end
 
 function RadioGroup:addWidget(widget)
@@ -25,6 +26,13 @@ function RadioGroup:removeWidget(widget)
   table.removevalue(self.widgets, widget)
 end
 
+function RadioGroup:destroy()
+  for k,widget in pairs(self.widgets) do
+    widget.onMousePress = nil
+  end
+  self.widgets = {}
+end
+
 function RadioGroup:selectWidget(selectedWidget)
   if selectedWidget == self.selectedWidget then return end
 

modules/game_npctrade/npctrade.lua

@@ -59,7 +59,7 @@ function NPCTrade.init()
 end
 
 function NPCTrade.terminate()
-  radioTabs:destroy()
+  --radioTabs:destroy()
   radioTabs = nil
   npcWindow:destroy()
   npcWindow = nil
@@ -229,7 +229,10 @@ function NPCTrade.createItemsOnPanel()
   
   offerSelected = nil
   itemsPanel:destroyChildren()
-  
+
+  if radioItems then
+    radioItems:destroy()
+  end
   radioItems = RadioGroup.create()
   
   for i, v in pairs(cacheItems) do