diff --git a/.gitignore b/.gitignore
index 428942f..a764075 100644
--- a/.gitignore
+++ b/.gitignore
@@ -15,3 +15,6 @@ hs_err_pid*
 /target/
 /store/
 /nbproject/private
+
+# Backup files
+*~
diff --git a/src/opensesim/gui/AssetEditor/AssetEditorPanel.form b/src/opensesim/gui/AssetEditor/AssetEditorPanel.form
index 5cd0cc4..adfd875 100644
--- a/src/opensesim/gui/AssetEditor/AssetEditorPanel.form
+++ b/src/opensesim/gui/AssetEditor/AssetEditorPanel.form
@@ -101,8 +101,12 @@
       </Properties>
     </Component>
     <Component class="opensesim.gui.util.JTextFieldLimit" name="symField">
+      <Events>
+        <EventHandler event="actionPerformed" listener="java.awt.event.ActionListener" parameters="java.awt.event.ActionEvent" handler="symFieldActionPerformed"/>
+      </Events>
       <AuxValues>
-        <AuxValue name="JavaCodeGenerator_VariableModifier" type="java.lang.Integer" value="4"/>
+        <AuxValue name="JavaCodeGenerator_DeclarationPre" type="java.lang.String" value="@Export"/>
+        <AuxValue name="JavaCodeGenerator_VariableModifier" type="java.lang.Integer" value="1"/>
       </AuxValues>
     </Component>
     <Component class="javax.swing.JLabel" name="jLabel3">