diff --git a/WebWindowComplex/Json/WindowConst.cs b/WebWindowComplex/Json/WindowConst.cs
index 2eedc6f..da32eae 100644
--- a/WebWindowComplex/Json/WindowConst.cs
+++ b/WebWindowComplex/Json/WindowConst.cs
@@ -36,6 +36,7 @@ namespace WebWindowComplex.Json
             ARC_FULL = 12,
             FILLET = 13,
             DOUBLEARC = 14,
+            THREECENTERARC = 15,
             TRIANGLE = 21,
             CUSTOM = 100
         }
diff --git a/WebWindowComplex/Models/Frame.cs b/WebWindowComplex/Models/Frame.cs
index 4ef5eb4..3e231f5 100644
--- a/WebWindowComplex/Models/Frame.cs
+++ b/WebWindowComplex/Models/Frame.cs
@@ -137,6 +137,15 @@ namespace WebWindowComplex.Models
                                 break;
                             }
 
+                        case Shapes.THREECENTERARC:
+                            {
+                                DimensionList.Add(new FrameDimension(this, 1, "Width", 2000, true));
+                                DimensionList.Add(new FrameDimension(this, 2, "Height", 2400 - (0.4 * widthVal), true));
+                                DimensionList.Add(new FrameDimension(this, 3, "Full Height", 2400, true));
+                                DimensionList.Add(new FrameDimension(this, 4, "Radius", 200, true));
+                                break;
+                            }
+
                         case Shapes.TRIANGLE:
                             {
                                 DimensionList.Add(new FrameDimension(this, 1, "Width", widthVal, true));
@@ -180,6 +189,14 @@ namespace WebWindowComplex.Models
                                 break;
                             }
 
+                        case Shapes.THREECENTERARC:
+                            {
+                                JointList.Add(new Joint(this, 1, oldJointType[0].SelJointType));
+                                JointList.Add(new Joint(this, 2, oldJointType[1].SelJointType));
+                                JointList.Add(new Joint(this, 3, Joints.ANGLED));
+                                JointList.Add(new Joint(this, 4, Joints.ANGLED));
+                                break;
+                            }
                         case Shapes.TRIANGLE:
                             {
                                 JointList.Add(new Joint(this, 1, oldJointType[0].SelJointType));
@@ -311,6 +328,15 @@ namespace WebWindowComplex.Models
                         break;
                     }
 
+                case Shapes.THREECENTERARC:
+                    {
+                        DimensionList.Add(new FrameDimension(this, 1, "Width", 800, true));
+                        DimensionList.Add(new FrameDimension(this, 2, "Height", 2100, true));
+                        DimensionList.Add(new FrameDimension(this, 3, "Full Height", 2400, true));
+                        DimensionList.Add(new FrameDimension(this, 4, "Radius", 100, true));
+                        break;
+                    }
+
                 case Shapes.TRIANGLE:
                     {
                         DimensionList.Add(new FrameDimension(this, 1, "Width", 2000, true));
@@ -344,6 +370,7 @@ namespace WebWindowComplex.Models
                     }
 
                 case Shapes.ARC_FULL:
+                case Shapes.THREECENTERARC:
                     {
                         JointList.Add(new Joint(this, 1, Joints.FULL_H));
                         JointList.Add(new Joint(this, 2, Joints.FULL_H));
@@ -392,6 +419,7 @@ namespace WebWindowComplex.Models
                 new IdNameStruct((int)Shapes.ARC, "Arc"),
                 new IdNameStruct((int)Shapes.ARC_FULL, "Arc Full"),
                 new IdNameStruct((int)Shapes.DOUBLEARC, "Double Arc"),
+                new IdNameStruct((int)Shapes.THREECENTERARC, "Three Center Arc"),
                 new IdNameStruct((int)Shapes.TRIANGLE, "Triangle")
         };
 
diff --git a/WebWindowComplex/Models/FrameDimension.cs b/WebWindowComplex/Models/FrameDimension.cs
index 66fa6a8..6c6feac 100644
--- a/WebWindowComplex/Models/FrameDimension.cs
+++ b/WebWindowComplex/Models/FrameDimension.cs
@@ -37,7 +37,7 @@ namespace WebWindowComplex.Models
                 {
                     m_dValue = MaxDim;
                 }
-                else if (value < MinDim)
+                else if (value < MinDim && !m_sName.Equals("Radius"))
                 {
                     m_dValue = MinDim;
                 }