diff -r 90b349cdd47f -r c563220d9aea ui/common/types.c
--- a/ui/common/types.c	Sun Dec 07 12:12:02 2025 +0100
+++ b/ui/common/types.c	Sun Dec 07 12:24:12 2025 +0100
@@ -212,6 +212,7 @@
 
 UiModel* ui_model(UiContext *ctx, ...) {
     UiModel *info = ui_calloc(ctx, 1, sizeof(UiModel));
+    info->ctx = ctx;
     
     va_list ap;
     va_start(ap, ctx);
@@ -253,6 +254,7 @@
 
 UiModel* ui_model_new(UiContext *ctx) {
     UiModel *info = ui_calloc(ctx, 1, sizeof(UiModel));
+    info->ctx = ctx;
     info->alloc = UI_MODEL_DEFAULT_ALLOC_SIZE;
     info->types = ui_calloc(ctx, UI_MODEL_DEFAULT_ALLOC_SIZE, sizeof(UiModelType));
     info->titles = ui_calloc(ctx, UI_MODEL_DEFAULT_ALLOC_SIZE, sizeof(char*));
@@ -277,6 +279,7 @@
     const CxAllocator* a = ctx ? ctx->allocator : cxDefaultAllocator;
 
     UiModel* newmodel = cxMalloc(a, sizeof(UiModel));
+    newmodel->ctx = ctx;
     *newmodel = *model;
 
     newmodel->types = cxCalloc(a, model->columns, sizeof(UiModelType));
@@ -292,8 +295,19 @@
     return newmodel;
 }
 
-void ui_model_free(UiContext *ctx, UiModel *mi) {
-    const CxAllocator* a = ctx ? ctx->allocator : cxDefaultAllocator;
+void ui_model_ref(UiModel *model) {
+    model->ref++;
+}
+
+void ui_model_unref(UiModel *model) {
+    if(--model->ref == 0) {
+        ui_model_free(model);
+    }
+}
+
+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]);
     }
@@ -735,9 +749,7 @@
 }
 
 UIEXPORT void ui_listselection_free(UiListSelection selection) {
-    if (selection.rows) {
-        free(selection.rows);
-    }
+    free(selection.rows);
 }
 
 UIEXPORT UiStr ui_str(char *cstr) {