diff --git a/form/Checkbox.js b/form/Checkbox.js
index 5cf5435..4c7be0c 100644
--- a/form/Checkbox.js
+++ b/form/Checkbox.js
@@ -2,10 +2,11 @@ Ext.define('Proxmox.form.Checkbox', {
     extend: 'Ext.form.field.Checkbox',
     alias: ['widget.proxmoxcheckbox'],
 
-    defaultValue: undefined,
-
-    deleteDefaultValue: false,
-    deleteEmpty: false,
+    config: {
+	defaultValue: undefined,
+	deleteDefaultValue: false,
+	deleteEmpty: false
+    },
 
     inputValue: '1',
 
@@ -17,12 +18,12 @@ Ext.define('Proxmox.form.Checkbox', {
             val = me.getSubmitValue();
             if (val !== null) {
                 data = {};
-		if ((val == me.defaultValue) && me.deleteDefaultValue) {
+		if ((val == me.getDefaultValue()) && me.getDeleteDefaultValue()) {
 		    data['delete'] = me.getName();
 		} else {
                     data[me.getName()] = val;
 		}
-            } else if (me.deleteEmpty) {
+            } else if (me.getDeleteEmpty()) {
                data = {};
                data['delete'] = me.getName();
 	    }
diff --git a/form/IntegerField.js b/form/IntegerField.js
index b947ea6..dc18f1d 100644
--- a/form/IntegerField.js
+++ b/form/IntegerField.js
@@ -2,13 +2,15 @@ Ext.define('Proxmox.form.field.Integer',{
     extend: 'Ext.form.field.Number',
     alias: 'widget.proxmoxintegerfield',
 
+    config: {
+	deleteEmpty: false
+    },
+
     allowDecimals: false,
     allowExponential: false,
     step: 1,
 
-    deleteEmpty: false,
-
-    getSubmitData: function() {
+   getSubmitData: function() {
         var me = this,
             data = null,
             val;
@@ -17,7 +19,7 @@ Ext.define('Proxmox.form.field.Integer',{
             if (val !== undefined && val !== null && val !== '') {
                 data = {};
                 data[me.getName()] = val;
-            } else if (me.deleteEmpty) {
+            } else if (me.getDeleteEmpty()) {
 		data = {};
                 data['delete'] = me.getName();
 	    }
diff --git a/form/KVComboBox.js b/form/KVComboBox.js
index d8167ac..0970fcf 100644
--- a/form/KVComboBox.js
+++ b/form/KVComboBox.js
@@ -9,7 +9,10 @@ Ext.define('Proxmox.form.KVComboBox', {
     extend: 'Ext.form.field.ComboBox',
     alias: 'widget.proxmoxKVComboBox',
 
-    deleteEmpty: true,
+    config: {
+	deleteEmpty: true
+    },
+
     comboItems: undefined,
     displayField: 'value',
     valueField: 'key',
@@ -25,7 +28,7 @@ Ext.define('Proxmox.form.KVComboBox', {
             if (val !== null && val !== '' && val !== '__default__') {
                 data = {};
                 data[me.getName()] = val;
-            } else if (me.deleteEmpty) {
+            } else if (me.getDeleteEmpty()) {
                 data = {};
                 data['delete'] = me.getName();
             }
diff --git a/form/TextField.js b/form/TextField.js
index 3fd36ce..feab4bc 100644
--- a/form/TextField.js
+++ b/form/TextField.js
@@ -2,9 +2,11 @@ Ext.define('Proxmox.form.field.Textfield', {
     extend: 'Ext.form.field.Text',
     alias: ['widget.proxmoxtextfield'],
 
-    skipEmptyText: true,
+    config: {
+	skipEmptyText: true,
 
-    deleteEmpty: false,
+	deleteEmpty: false,
+    },
 
     getSubmitData: function() {
         var me = this,
@@ -15,7 +17,7 @@ Ext.define('Proxmox.form.field.Textfield', {
             if (val !== null) {
                 data = {};
                 data[me.getName()] = val;
-            } else if (me.deleteEmpty) {
+            } else if (me.getDeleteEmpty()) {
 		data = {};
                 data['delete'] = me.getName();
 	    }
@@ -31,6 +33,6 @@ Ext.define('Proxmox.form.field.Textfield', {
 	    return value;
 	}
 
-	return me.skipEmptyText ? null: value;
+	return me.getSkipEmptyText() ? null: value;
     }
 });