diff -r c563220d9aea -r 5d4419042d9b ui/common/types.c
--- a/ui/common/types.c	Sun Dec 07 12:24:12 2025 +0100
+++ b/ui/common/types.c	Sun Dec 07 14:39:03 2025 +0100
@@ -252,6 +252,15 @@
 
 #define UI_MODEL_DEFAULT_ALLOC_SIZE 16
 
+
+static void model_notify_observer(UiModel *model, int insert, int delete) {
+    UiModelChangeObserver *obs = model->observer;
+    while(obs) {
+        obs->update(model, obs->userdata, insert, delete);
+        obs = obs->next;
+    }
+}
+
 UiModel* ui_model_new(UiContext *ctx) {
     UiModel *info = ui_calloc(ctx, 1, sizeof(UiModel));
     info->ctx = ctx;
@@ -262,16 +271,21 @@
     return info;
 }
 
-void ui_model_add_column(UiContext *ctx, UiModel *model, UiModelType type, const char *title, int width) {
+void ui_model_add_column(UiModel *model, UiModelType type, const char *title, int width) {
+    UiContext *ctx = model->ctx;
     if(model->columns >= model->alloc) {
         model->alloc += UI_MODEL_DEFAULT_ALLOC_SIZE;
         model->types = ui_realloc(ctx, model->types, model->alloc * sizeof(UiModelType));
         model->titles = ui_realloc(ctx, model->titles, model->alloc * sizeof(char*));
         model->columnsize = ui_realloc(ctx, model->columnsize, model->alloc * sizeof(int));
     }
-    model->types[model->columns] = type;
-    model->titles[model->columns] = ui_strdup(ctx, title);
-    model->columnsize[model->columns] = width;
+    int index = model->columns;
+    model->types[index] = type;
+    model->titles[index] = ui_strdup(ctx, title);
+    model->columnsize[index] = width;
+    
+    model_notify_observer(model, index, -1);
+    
     model->columns++;
 }
 
@@ -299,18 +313,63 @@
     model->ref++;
 }
 
-void ui_model_unref(UiModel *model) {
+void ui_model_unref(UiModel *model) { 
     if(--model->ref == 0) {
         ui_model_free(model);
     }
 }
 
+void ui_model_add_observer(UiModel *model, ui_model_update_func update, void *data) {
+    UiModelChangeObserver *observer = ui_malloc(model->ctx, sizeof(UiModelChangeObserver));
+    observer->update = update;
+    observer->userdata = data;
+    observer->next = NULL;
+    
+    if(model->observer) {
+        UiModelChangeObserver *last = model->observer;
+        while(last->next) {
+            last = last->next;
+        }
+        last->next = observer;
+    } else {
+        model->observer = observer;
+    }
+}
+
+void ui_model_remove_observer(UiModel *model, void *data) {
+    if(model->observer) {
+        UiModelChangeObserver *obs = model->observer;
+        UiModelChangeObserver *prev = NULL;
+        while(obs) {
+            if(obs->userdata == data) {
+                // remove
+                if(prev) {
+                    prev->next = obs->next;
+                } else {
+                    model->observer = obs->next;
+                }
+                // free
+                ui_free(model->ctx, obs);
+                break;
+            }
+            prev = obs;
+            obs = obs->next;
+        }
+    }
+}
+
 void ui_model_free(UiModel *mi) {
     UiContext *ctx = mi->ctx;
     const CxAllocator* a = ctx->allocator;
     for(int i=0;i<mi->columns;i++) {
         ui_free(ctx, mi->titles[i]);
     }
+    UiModelChangeObserver *obs = mi->observer;
+    while(obs) {
+        UiModelChangeObserver *n = obs->next;
+        cxFree(a, obs);
+        obs = n;
+    }
     cxFree(a, mi->types);
     cxFree(a, mi->titles);
     cxFree(a, mi->columnsize);