diff --git a/cobertura.xml b/cobertura.xml
index 0e6bfef..d0b5a29 100644
--- a/cobertura.xml
+++ b/cobertura.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE coverage SYSTEM "http://cobertura.sourceforge.net/xml/coverage-04.dtd">
-<coverage line-rate="0.75030339805825" branch-rate="0" lines-covered="2473" lines-valid="3296" branches-covered="0" branches-valid="0" complexity="1420" version="0.4" timestamp="1753639034">
+<coverage line-rate="0.75030339805825" branch-rate="0" lines-covered="2473" lines-valid="3296" branches-covered="0" branches-valid="0" complexity="1420" version="0.4" timestamp="1754725263">
   <sources>
     <source>/home/thomas/projekte/calc/src</source>
   </sources>
@@ -8384,84 +8384,84 @@
           <methods>
             <method name="__construct" signature="" line-rate="1" branch-rate="0" complexity="1">
               <lines>
-                <line number="13" hits="10"/>
-                <line number="14" hits="10"/>
+                <line number="15" hits="10"/>
+                <line number="16" hits="10"/>
               </lines>
             </method>
             <method name="addOption" signature="Base $option" line-rate="1" branch-rate="0" complexity="1">
               <lines>
-                <line number="19" hits="8"/>
+                <line number="21" hits="8"/>
               </lines>
             </method>
             <method name="getOptions" signature="" line-rate="1" branch-rate="0" complexity="1">
               <lines>
-                <line number="24" hits="7"/>
+                <line number="26" hits="7"/>
               </lines>
             </method>
             <method name="getOptionById" signature="string $id" line-rate="0" branch-rate="0" complexity="1">
               <lines>
-                <line number="29" hits="0"/>
-                <line number="30" hits="0"/>
                 <line number="31" hits="0"/>
+                <line number="32" hits="0"/>
+                <line number="33" hits="0"/>
               </lines>
             </method>
             <method name="generateXML" signature="" line-rate="1" branch-rate="0" complexity="3">
               <lines>
-                <line number="36" hits="3"/>
-                <line number="37" hits="3"/>
                 <line number="38" hits="3"/>
-                <line number="39" hits="2"/>
-                <line number="40" hits="2"/>
+                <line number="39" hits="3"/>
+                <line number="40" hits="3"/>
                 <line number="41" hits="2"/>
                 <line number="42" hits="2"/>
-                <line number="45" hits="2"/>
-                <line number="46" hits="2"/>
-                <line number="49" hits="3"/>
+                <line number="43" hits="2"/>
+                <line number="44" hits="2"/>
+                <line number="47" hits="2"/>
+                <line number="48" hits="2"/>
+                <line number="51" hits="3"/>
               </lines>
             </method>
             <method name="generateJson" signature="" line-rate="0.9" branch-rate="0" complexity="3">
               <lines>
-                <line number="54" hits="3"/>
-                <line number="55" hits="3"/>
                 <line number="56" hits="3"/>
                 <line number="57" hits="3"/>
                 <line number="58" hits="3"/>
                 <line number="59" hits="3"/>
-                <line number="60" hits="0"/>
-                <line number="62" hits="3"/>
-                <line number="63" hits="2"/>
-                <line number="65" hits="3"/>
+                <line number="60" hits="3"/>
+                <line number="61" hits="3"/>
+                <line number="62" hits="0"/>
+                <line number="64" hits="3"/>
+                <line number="65" hits="2"/>
+                <line number="67" hits="3"/>
               </lines>
             </method>
           </methods>
           <lines>
-            <line number="13" hits="10"/>
-            <line number="14" hits="10"/>
-            <line number="19" hits="8"/>
-            <line number="24" hits="7"/>
-            <line number="29" hits="0"/>
-            <line number="30" hits="0"/>
+            <line number="15" hits="10"/>
+            <line number="16" hits="10"/>
+            <line number="21" hits="8"/>
+            <line number="26" hits="7"/>
             <line number="31" hits="0"/>
-            <line number="36" hits="3"/>
-            <line number="37" hits="3"/>
+            <line number="32" hits="0"/>
+            <line number="33" hits="0"/>
             <line number="38" hits="3"/>
-            <line number="39" hits="2"/>
-            <line number="40" hits="2"/>
+            <line number="39" hits="3"/>
+            <line number="40" hits="3"/>
             <line number="41" hits="2"/>
             <line number="42" hits="2"/>
-            <line number="45" hits="2"/>
-            <line number="46" hits="2"/>
-            <line number="49" hits="3"/>
-            <line number="54" hits="3"/>
-            <line number="55" hits="3"/>
+            <line number="43" hits="2"/>
+            <line number="44" hits="2"/>
+            <line number="47" hits="2"/>
+            <line number="48" hits="2"/>
+            <line number="51" hits="3"/>
             <line number="56" hits="3"/>
             <line number="57" hits="3"/>
             <line number="58" hits="3"/>
             <line number="59" hits="3"/>
-            <line number="60" hits="0"/>
-            <line number="62" hits="3"/>
-            <line number="63" hits="2"/>
-            <line number="65" hits="3"/>
+            <line number="60" hits="3"/>
+            <line number="61" hits="3"/>
+            <line number="62" hits="0"/>
+            <line number="64" hits="3"/>
+            <line number="65" hits="2"/>
+            <line number="67" hits="3"/>
           </lines>
         </class>
       </classes>
diff --git a/src/Option/Type/Row/Column.php b/src/Option/Type/Row/Column.php
index fba89a1..8365750 100644
--- a/src/Option/Type/Row/Column.php
+++ b/src/Option/Type/Row/Column.php
@@ -8,6 +8,8 @@ class Column extends Base
 {
     private \ArrayIterator $options;
 
+    public $type = 'column';
+
     public function __construct()
     {
         parent::__construct();