diff --git a/Designing/WinLib/WinCalculate.lua b/Designing/WinLib/WinCalculate.lua
index f6b211a..bbbf53f 100644
--- a/Designing/WinLib/WinCalculate.lua
+++ b/Designing/WinLib/WinCalculate.lua
@@ -852,6 +852,12 @@ local function CalcProfileType( nAreaId)
       local nOutlineId = EgtGetFirstInGroup( nOutlineLayerId)
       while nOutlineId do
          local sName = EgtGetName( nOutlineId)
+         
+         -- verifico se soglia
+         if sName == WIN_BOTTOM then
+            EgtSetInfo( nOutlineId, WIN_THRESHOLD, bThreshold)
+         end
+         
          -- recupero il tipo dei figli
          local nChildrenType = GetChildrenType( nOutlineId)
          
@@ -860,7 +866,6 @@ local function CalcProfileType( nAreaId)
             local nBottomRail = EgtGetInfo( nAreaId, WIN_BOTTOMRAIL, 'i') or 0
             if nBottomRail > 0 then
                -- se bottomrail gestisco come fixed
-               bThreshold = false
                if sName == WIN_BOTTOM then
                   EgtSetInfo( nOutlineId, WIN_PROFILETYPE, WIN_RAIL .. '_' .. sThreshold)
                else
@@ -919,10 +924,9 @@ local function CalcProfileType( nAreaId)
                   EgtSetInfo( nOutlineId, WIN_PROFILETYPE, WIN_SASH_TOP)
                end
             end
-            
+
          -- c) se riempimento
          elseif nChildrenType == WIN_CHILDREN_TYPES.FILL then
-            bThreshold = false
             if sName == WIN_BOTTOM then
                -- verifico presenza bottomrail
                local nBottomRail = EgtGetInfo( nAreaId, WIN_BOTTOMRAIL, 'i') or 0
@@ -938,7 +942,6 @@ local function CalcProfileType( nAreaId)
          -- d) se cambio profilo
          elseif nChildrenType == WIN_CHILDREN_TYPES.MIXED then
             EgtRemoveInfo( nAreaId, WIN_BOTTOMRAIL)
-            bThreshold = false
             EgtSetInfo( nOutlineId, WIN_PRF_CHANGE, true)
             if sName == WIN_BOTTOM then
                EgtSetInfo( nOutlineId, WIN_PROFILETYPE, WIN_MIXED_BOTTOM)
@@ -946,12 +949,9 @@ local function CalcProfileType( nAreaId)
                EgtSetInfo( nOutlineId, WIN_PROFILETYPE, WIN_MIXED_TOP)
             end
          end
+         
          nOutlineId = EgtGetNext( nOutlineId)
       end
-      -- assegno info soglia
-      if bThreshold then
-         EgtSetInfo( nAreaId, WIN_THRESHOLD, true)
-      end
 
 
    -- SPLIT
@@ -1629,10 +1629,9 @@ local function CalculateOutlineFromAreaOutline( nAreaId)
          local nOutlineId = EgtCopyGlob( nAreaOutlineId, nOutlineLayerId)
          EgtSetInfo( nAreaOutlineId, WIN_COPY, nOutlineId)
          EgtSetInfo( nOutlineId, WIN_COPY, nAreaOutlineId)
-         -- se bottom riporto informazione dei bottomrail e soglia
+         -- se bottom riporto informazione dei bottomrail
          if EgtGetName( nOutlineId) == WIN_BOTTOM then
             CopyInfo( nOutlineId, nAreaId, WIN_BOTTOMRAIL)
-            CopyInfo( nOutlineId, nAreaId, WIN_THRESHOLD)
          end
          nAreaOutlineId = EgtGetNext( nAreaOutlineId)
       end
@@ -6786,7 +6785,7 @@ function WinCalculate.AddAccessories( nAreaId, bDraw)
 
       -- accessori del pezzo inferiore: soglia e gocciolatoio
       local nBottomId = EgtGetFirstNameInGroup( nOutlineLayId, WIN_BOTTOM)
-      local bThreshold = EgtGetInfo( nAreaId, WIN_THRESHOLD, 'b') or false
+      local bThreshold = EgtGetInfo( nBottomId, WIN_THRESHOLD, 'b') or false
       if bThreshold then
          -- soglia
          CalcThreshold( nBottomId, nAreaId)
@@ -7180,7 +7179,9 @@ local function CalcPreview( nFrameId)
    end
    
    -- preview soglia
-   local bThreshold = EgtGetInfo( nFrameId, WIN_THRESHOLD, 'b') or false
+   local nOutlineGrpId = EgtGetFirstNameInGroup( nFrameId, WIN_OUTLINE)
+   local nBottomId = EgtGetFirstNameInGroup( nOutlineGrpId, WIN_BOTTOM)
+   local bThreshold = EgtGetInfo( nBottomId, WIN_THRESHOLD, 'b') or false
    if bThreshold then
       CalcThresholdPreview( nFrameId, nPreviewGrp)
    end