diff -r c563220d9aea -r 5d4419042d9b ui/gtk/list.c
--- a/ui/gtk/list.c	Sun Dec 07 12:24:12 2025 +0100
+++ b/ui/gtk/list.c	Sun Dec 07 14:39:03 2025 +0100
@@ -80,6 +80,7 @@
     memset(tableview, 0, sizeof(UiListView));
     tableview->obj = obj;
     tableview->model = args->model;
+    tableview->multiselection = args->multiselection;
     tableview->onactivate = args->onactivate;
     tableview->onactivatedata = args->onactivatedata;
     tableview->onselection = args->onselection;
@@ -98,6 +99,9 @@
     tableview->onsave = args->onsave;
     tableview->onsavedata = args->onsavedata;
     
+    tableview->coldata.listview = tableview;
+    tableview->coldata.column = 0;
+    
     if(args->getvalue2) {
         tableview->getvalue = args->getvalue2;
         tableview->getvaluedata = args->getvalue2data;
@@ -200,7 +204,7 @@
 static void column_factory_setup(GtkListItemFactory *factory, GtkListItem *item, gpointer userdata) {
     UiColData *col = userdata;
     UiModel *model = col->listview->model;
-    UiModelType type = model->types[col->model_column];
+    UiModelType type = model->types[col->column];
     if(type == UI_ICON_TEXT || type == UI_ICON_TEXT_FREE) {
         GtkWidget *hbox = gtk_box_new(GTK_ORIENTATION_HORIZONTAL, 6);
         GtkWidget *image = gtk_image_new();
@@ -281,16 +285,17 @@
     UiColData *col = userdata;
     UiList *list = col->listview->var ? col->listview->var->value : NULL;
     UiListView *listview = col->listview;
+    int datacolumn = listview->columns[col->column];
      
     ObjWrapper *obj = gtk_list_item_get_item(item);
     UiModel *model = col->listview->model;
-    UiModelType type = model->types[col->model_column];
+    UiModelType type = model->types[col->column];
     
     // cache the GtkListItem
     CxHashKey row_key = cx_hash_key(&obj->i, sizeof(int));
     UiRowItems *row = cxMapGet(listview->bound_rows, row_key);
     if(row) {
-        if(row->items[col->model_column] == NULL) {
+        if(row->items[col->column] == NULL) {
             row->bound++;
         }
     } else {
@@ -298,10 +303,10 @@
         cxMapPut(listview->bound_rows, row_key, row);
         row->bound = 1;
     }
-    row->items[col->model_column] = item;
+    row->items[col->column] = item;
     
     UiBool freevalue = FALSE;
-    void *data = listview->getvalue(list, obj->data, obj->i, col->data_column, listview->getvaluedata, &freevalue);
+    void *data = listview->getvalue(list, obj->data, obj->i, datacolumn, listview->getvaluedata, &freevalue);
     GtkWidget *child = gtk_list_item_get_child(item);
     
     PangoAttrList *attributes = NULL;
@@ -319,7 +324,7 @@
             }
         }
         
-        int style_col = col->data_column;
+        int style_col = datacolumn;
         if(type == UI_ICON_TEXT || type == UI_ICON_TEXT_FREE) {
             style_col++; // col->data_column is the icon, we need the next col for the label
         }
@@ -363,7 +368,7 @@
             
         }
         case UI_ICON_TEXT_FREE: {
-            void *data2 = listview->getvalue(list, obj->data, obj->i, col->data_column+1, listview->getvaluedata, &freevalue);
+            void *data2 = listview->getvalue(list, obj->data, obj->i, datacolumn+1, listview->getvaluedata, &freevalue);
             if(type == UI_ICON_TEXT_FREE) {
                 freevalue = TRUE;
             }
@@ -387,7 +392,7 @@
             if(entry) {
                 entry->listview = col->listview;
                 entry->row = obj->i;
-                entry->col = col->data_column;
+                entry->col = datacolumn;
                 entry->previous_value = strdup(data);
             }
             ENTRY_SET_TEXT(child, data);
@@ -411,7 +416,7 @@
     CxHashKey row_key = cx_hash_key(&obj->i, sizeof(int));
     UiRowItems *row = cxMapGet(listview->bound_rows, row_key);
     if(row) {
-        row->items[col->model_column] = NULL;
+        row->items[col->column] = NULL;
         row->bound--;
         if(row->bound == 0) {
             cxMapRemove(listview->bound_rows, row_key);
@@ -457,17 +462,15 @@
     }
     
     listview->numcolumns = 1;
-    listview->columns = malloc(sizeof(UiColData));
-    listview->columns->listview = listview;
-    listview->columns->data_column = 0;
-    listview->columns->model_column = 0;
+    listview->columns = malloc(sizeof(int));
+    listview->columns[0] = 0;
     
     listview->bound_rows = cxHashMapCreate(NULL, CX_STORE_POINTERS, 128);
     listview->bound_rows->collection.simple_destructor = (cx_destructor_func)free;
      
     GtkListItemFactory *factory = gtk_signal_list_item_factory_new();
-    g_signal_connect(factory, "setup", G_CALLBACK(column_factory_setup), listview->columns);
-    g_signal_connect(factory, "bind", G_CALLBACK(column_factory_bind), listview->columns);
+    g_signal_connect(factory, "setup", G_CALLBACK(column_factory_setup), &listview->coldata);
+    g_signal_connect(factory, "bind", G_CALLBACK(column_factory_bind), &listview->coldata);
     
     GtkSelectionModel *selection_model = create_selection_model(listview, ls, args->multiselection);
     GtkWidget *view = gtk_list_view_new(GTK_SELECTION_MODEL(selection_model), factory);
@@ -554,17 +557,15 @@
     }
     
     listview->numcolumns = 1;
-    listview->columns = malloc(sizeof(UiColData));
-    listview->columns->listview = listview;
-    listview->columns->data_column = 0;
-    listview->columns->model_column = 0;
+    listview->columns = malloc(sizeof(int));
+    listview->columns[0] = 0;
     
     listview->bound_rows = cxHashMapCreate(NULL, CX_STORE_POINTERS, 128);
     listview->bound_rows->collection.simple_destructor = (cx_destructor_func)free;
     
     GtkListItemFactory *factory = gtk_signal_list_item_factory_new();
-    g_signal_connect(factory, "setup", G_CALLBACK(column_factory_setup), listview->columns);
-    g_signal_connect(factory, "bind", G_CALLBACK(column_factory_bind), listview->columns);
+    g_signal_connect(factory, "setup", G_CALLBACK(column_factory_setup), &listview->coldata);
+    g_signal_connect(factory, "bind", G_CALLBACK(column_factory_bind), &listview->coldata);
     
     GtkWidget *view = gtk_drop_down_new(G_LIST_MODEL(ls), NULL);
     gtk_drop_down_set_factory(GTK_DROP_DOWN(view), factory);
@@ -623,6 +624,30 @@
     gtk_drop_down_set_selected(GTK_DROP_DOWN(dropdown), index);
 }
 
+static void add_column(UiListView *tableview, int index) {
+    UiModel *model = tableview->model;
+    
+    UiColData *col = malloc(sizeof(UiColData));
+    col->listview = tableview;
+    col->column = index;
+    
+    GtkListItemFactory *factory = gtk_signal_list_item_factory_new();
+    g_signal_connect(factory, "setup", G_CALLBACK(column_factory_setup), col);
+    g_signal_connect(factory, "bind", G_CALLBACK(column_factory_bind), col);
+    g_object_set_data_full(G_OBJECT(factory), "coldata", col, (GDestroyNotify)free);
+
+    GtkColumnViewColumn *column = gtk_column_view_column_new(model->titles[index], factory);
+    gtk_column_view_column_set_resizable(column, true);
+    gtk_column_view_insert_column(GTK_COLUMN_VIEW(tableview->widget), index, column);
+
+    int size = model->columnsize[index];
+    if(size > 0) {
+        gtk_column_view_column_set_fixed_width(column, size);
+    } else if(size < 0) {
+        gtk_column_view_column_set_expand(column, TRUE);
+    }
+}
+
 UIWIDGET ui_table_create(UiObject *obj, UiListArgs *args) {
     GListStore *ls = g_list_store_new(G_TYPE_OBJECT);
     //g_list_store_append(ls, v1);
@@ -650,7 +675,11 @@
     
     // create columns from UiModel
     UiModel *model = args->model;
-    int columns = model ? model->columns : 0;
+    int columns = 0;
+    if(model) {
+        columns = model->columns;
+        ui_model_add_observer(model, ui_listview_update_model, tableview);
+    }
     
     tableview->columns = calloc(columns, sizeof(UiColData));
     tableview->numcolumns = columns;
@@ -660,30 +689,14 @@
     
     int addi = 0;
     for(int i=0;i<columns;i++) {
-        tableview->columns[i].listview = tableview;
-        tableview->columns[i].model_column = i;
-        tableview->columns[i].data_column = i+addi;
+        tableview->columns[i] = i+addi;
         
         if(model->types[i] == UI_ICON_TEXT || model->types[i] == UI_ICON_TEXT_FREE) {
             // icon+text has 2 data columns
             addi++;
         }
         
-        GtkListItemFactory *factory = gtk_signal_list_item_factory_new();
-        UiColData *col = &tableview->columns[i]; 
-        g_signal_connect(factory, "setup", G_CALLBACK(column_factory_setup), col);
-	g_signal_connect(factory, "bind", G_CALLBACK(column_factory_bind), col);
-        
-        GtkColumnViewColumn *column = gtk_column_view_column_new(model->titles[i], factory);
-        gtk_column_view_column_set_resizable(column, true);
-        gtk_column_view_append_column(GTK_COLUMN_VIEW(view), column);
-        
-        int size = model->columnsize[i];
-        if(size > 0) {
-            gtk_column_view_column_set_fixed_width(column, size);
-        } else if(size < 0) {
-            gtk_column_view_column_set_expand(column, TRUE);
-        }
+        add_column(tableview, i);
     }
     
     // bind listview to list
@@ -734,6 +747,33 @@
     return scroll_area;
 }
 
+void ui_listview_update_model(UiModel *model, void *userdata, int insert_index, int delete_index) {
+    UiListView *listview = userdata;
+    if(insert_index >= listview->numcolumns) {
+        listview->numcolumns = insert_index+1;
+        listview->columns = realloc(listview->columns, listview->numcolumns * sizeof(UiColData));
+    }
+    
+    gtk_column_view_set_model(GTK_COLUMN_VIEW(listview->widget), NULL);
+    
+    if(insert_index) {
+        listview->columns[insert_index] = insert_index;
+        add_column(listview, insert_index);
+        // TODO: adjust data_column if insert_index < numcolumns
+    } // TODO: delete_index
+    
+    GListStore *ls = g_list_store_new(G_TYPE_OBJECT);
+    GtkSelectionModel *selection_model = create_selection_model(listview, ls, listview->multiselection);
+    gtk_column_view_set_model(GTK_COLUMN_VIEW(listview->widget), selection_model);
+    listview->selectionmodel = selection_model;
+    listview->liststore = ls;
+    
+    if(listview->var) {
+        UiList *list = listview->var->value;
+        ui_list_update(list);
+    }
+}
+
 static UiListSelection selectionmodel_get_selection(GtkSelectionModel *model) {
     UiListSelection sel = { 0, NULL };
     GtkBitset *bitset = gtk_selection_model_get_selection(model);
@@ -2046,6 +2086,10 @@
     if(v->var) {
         ui_destroy_boundvar(v->obj->ctx, v->var);
     }
+    if(v->model) {
+        ui_model_remove_observer(v->model, v);
+        ui_model_unref(v->model);
+    }
     if(v->elements) {
         for(int i=0;i<v->nelm;i++) {
             free(v->elements[i]);