diff --git a/buildoz.js b/buildoz.js
index a145260..37b02c4 100644
--- a/buildoz.js
+++ b/buildoz.js
@@ -40,6 +40,7 @@ class Buildoz extends HTMLElement {
 
 class BZselect extends Buildoz {
     #value
+    #fillFromMarkup = true
 
     constructor(){
         super()
@@ -58,9 +59,12 @@ class BZselect extends Buildoz {
         this.prepend(this.button)
         this.button.addEventListener('click', this.toggle.bind(this))
         this.options = this.querySelectorAll('option')
-        for(const opt of this.options){ 
-            opt.addEventListener('click', this.onClick.bind(this))
-            if(opt.getAttribute('selected') !== null) this.onOption(opt.value, true)
+        if(this.#fillFromMarkup){ //can only do it once and only if fillOptions was not already called !!
+            for(const opt of this.options){ 
+                opt.addEventListener('click', this.onClick.bind(this))
+                if(opt.getAttribute('selected') !== null) this.onOption(opt.value, true)
+            }
+            this.#fillFromMarkup = false
         }
     }
     
@@ -88,7 +92,7 @@ class BZselect extends Buildoz {
         }
     }
 
-    toggle(){
+    toggle(){ 
         for(const opt of this.options){
             if(this.open) opt.classList.remove('open')
             else opt.classList.add('open')
@@ -96,7 +100,7 @@ class BZselect extends Buildoz {
         this.open = !this.open
     }
 
-    onClick(evt){
+    onClick(evt){ 
         const opt = evt.target.closest('option')
         if(opt && opt.value) this.onOption(opt.value) 
     }
@@ -108,17 +112,20 @@ class BZselect extends Buildoz {
     }
 
     addOption(value, markup){
+        // Caution: you can count on connectedCallback to have run already, because one might fill before adding to the DOM
         const opt = document.createElement('option')
         opt.setAttribute('value', value)
         opt.innerHTML = markup
         opt.addEventListener('click',this.onClick.bind(this))
         this.append(opt)
         this.options = this.querySelectorAll('option')
+        this.#fillFromMarkup = false
     }
 
     fillOptions(opts, erase = true){ 
+        // Caution: you can count on connectedCallback to have run already, because one might fill before adding to the DOM
         if(erase){
-            //this.options = this.querySelectorAll('option')
+            this.options = this.querySelectorAll('option') 
             this.options.forEach(node => { node.remove() })
             this.options = this.querySelectorAll('option')
             this.onOption('', true) // unselect last