view box has correct equals check now

Source/DataTypes/SvgViewBox.cs

@@ -85,6 +85,44 @@ namespace Svg
             this.Width = width;
             this.Height = height;
         }
+        
+        #region Equals and GetHashCode implementation
+        public override bool Equals(object obj)
+		{
+			return (obj is SvgViewBox) && Equals((SvgViewBox)obj);
+		}
+        
+		public bool Equals(SvgViewBox other)
+		{
+			return this.MinX == other.MinX 
+				&& this.MinY == MinY 
+				&& this.Width == other.Width 
+				&& this.Height == other.Height;
+		}
+        
+		public override int GetHashCode()
+		{
+			int hashCode = 0;
+			unchecked {
+				hashCode += 1000000007 * MinX.GetHashCode();
+				hashCode += 1000000009 * MinY.GetHashCode();
+				hashCode += 1000000021 * Width.GetHashCode();
+				hashCode += 1000000033 * Height.GetHashCode();
+			}
+			return hashCode;
+		}
+        
+		public static bool operator ==(SvgViewBox lhs, SvgViewBox rhs)
+		{
+			return lhs.Equals(rhs);
+		}
+        
+		public static bool operator !=(SvgViewBox lhs, SvgViewBox rhs)
+		{
+			return !(lhs == rhs);
+		}
+        #endregion
+
     }
 
     internal class SvgViewBoxConverter : TypeConverter

Source/SvgAttributeCollection.cs

@@ -118,6 +118,8 @@ namespace Svg
         			return UnboxAndCheck<int>(a, b);
         		else if(a is float)
         			return UnboxAndCheck<float>(a, b);
+        		else if(a is SvgViewBox)
+        			return UnboxAndCheck<SvgViewBox>(a, b);
         		else
         			return true;
         	}