diff --git a/include/Mw/Widget/TreeView.h b/include/Mw/Widget/TreeView.h
index 6c450b9..83f8b42 100644
--- a/include/Mw/Widget/TreeView.h
+++ b/include/Mw/Widget/TreeView.h
@@ -81,6 +81,16 @@ MwInline void MwTreeViewSetPixmap(MwWidget handle, void* item, MwLLPixmap pixmap
 	MwVaWidgetExecute(handle, "mwTreeViewSetPixmap", NULL, item, pixmap);
 }
 
+/*!
+ * @brief Sets the opened state of ithe item
+ * @param handle Widget
+ * @param item Item
+ * @param opened Opened or not
+ */
+MwInline void MwTreeViewSetOpened(MwWidget handle, void* item, int opened) {
+	MwVaWidgetExecute(handle, "mwTreeViewSetOpened", NULL, item, opened);
+}
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/core.c b/src/core.c
index 074145e..e184f8c 100644
--- a/src/core.c
+++ b/src/core.c
@@ -238,10 +238,10 @@ static void MwFreeWidget(MwWidget handle) {
 void MwDestroyWidget(MwWidget handle) {
 	if(handle->parent != NULL) {
 		int i;
-		for(i = 0; i < arrlen(handle->parent->destroy_queue); i++){
+		for(i = 0; i < arrlen(handle->parent->destroy_queue); i++) {
 			if(handle->parent->destroy_queue[i] == handle) break;
 		}
-		if(i == arrlen(handle->parent->destroy_queue)){
+		if(i == arrlen(handle->parent->destroy_queue)) {
 			arrput(handle->parent->destroy_queue, handle);
 		}
 	}
diff --git a/src/widget/treeview.c b/src/widget/treeview.c
index 564ec13..1d99316 100644
--- a/src/widget/treeview.c
+++ b/src/widget/treeview.c
@@ -410,7 +410,17 @@ static void mwTreeViewSetPixmapImpl(MwWidget handle, void* item, MwLLPixmap pixm
 
 	e->pixmap = pixmap;
 
-	if(e->parent != NULL && e->parent->opened) {
+	if(e->parent == NULL || (e->parent != NULL && e->parent->opened)) {
+		resize(handle);
+	}
+}
+
+static void mwTreeViewSetOpenedImpl(MwWidget handle, void* item, int opened) {
+	MwTreeViewEntry* e = item;
+
+	e->opened = opened;
+
+	if(e->parent == NULL || (e->parent != NULL && e->parent->opened)) {
 		resize(handle);
 	}
 }
@@ -443,6 +453,11 @@ static void func_handler(MwWidget handle, const char* name, void* out, va_list v
 		MwLLPixmap pixmap = va_arg(va, MwLLPixmap);
 		mwTreeViewSetPixmapImpl(handle, item, pixmap);
 	}
+	if(strcmp(name, "mwTreeViewSetOpened") == 0) {
+		void* item   = va_arg(va, void*);
+		int   opened = va_arg(va, int);
+		mwTreeViewSetOpenedImpl(handle, item, opened);
+	}
 }
 
 static void tick(MwWidget handle) {