[chore:] listbox item type is no string anymore (hopefully I tested everything?)

DataStore/DataStructures.cs

@@ -60,6 +60,11 @@ public class KasAddressList //Address-Set
         var id = listItemName.Split(" - ")[0];
         return int.Parse(id);
     }
+
+    public override string ToString()
+    {
+        return Name + " (" + KasPersons.Count + " Einträge)";
+    }
 }
 
 public class KasPerson
@@ -188,6 +193,18 @@ public class KasPerson
 
         return highest + base_id + 1;
     }
+
+    public override string ToString()
+    {
+        if (refsid != null && refsid != 0)
+        {
+            return refsid + " - " + name;
+        }
+        else
+        {
+            return id + " - " + name;
+        }
+    }
 }
 
 public class KasPersonError

DataStore/Settings.cs

@@ -135,7 +135,7 @@ public class Global
 public class Customers
 {
     public List<Customer> customers = new();
-    public int current { get; set; } = 0;
+    public Customer current { get; set; } = null;
 }
 
 public class Customer
@@ -149,6 +149,11 @@ public class Customer
 
         ID = highestID + 1;
     }
+    
+    public override string ToString()
+    {
+        return name;
+    }
 
     public string name { get; set; } = "";
     public string description { get; set; } = "";
@@ -158,11 +163,11 @@ public class Customer
     public int ID { get; }
 
 
-    public static int GetIDByCustomerListItem(string item_content)
-    {
-        var id = item_content.Split(" - ")[0];
-        return int.Parse(id);
-    }
+    // public static int GetIDByCustomerListItem(string item_content)
+    // {
+    //     var id = item_content.Split(" - ")[0];
+    //     return int.Parse(id);
+    // }
 }
 
 public class AddressSets