diff --git a/src/components/AppPage.vue b/src/components/AppPage.vue
index 511b397..4686692 100644
--- a/src/components/AppPage.vue
+++ b/src/components/AppPage.vue
@@ -1,25 +1,24 @@
 <template>
   <div class="app-page">
-    <slot/>
-    <slot v-if="false" name="left"/>
-    <slot v-if="false" name="center"/>
-    <slot v-if="false" name="right"/>
+    <slot />
+    <slot v-if="false" name="left" />
+    <slot v-if="false" name="center" />
+    <slot v-if="false" name="right" />
   </div>
 </template>
 
 <script lang="ts">
-
 import type { VNode } from 'vue'
 import { useBasicStore } from '@/store/basic'
-import { v4 } from "uuid";
+import { v4 } from 'uuid'
 export default defineComponent({
   name: 'AppPage',
   data() {
     return {
-      left: [] as VNode[],
-      right: [] as VNode[],
-      center: [] as VNode[],
-      default: [] as VNode[],
+      left: () => [] as VNode[],
+      right: () => [] as VNode[],
+      center: () => [] as VNode[],
+      default: () => [] as VNode[],
       id: v4()
     }
   },
@@ -36,30 +35,30 @@ export default defineComponent({
     this.onHide()
   },
   created() {
-    const { left, right, center, default: d } = this.$slots;
-    this.left = left?.() ?? [];
-    this.right = right?.() ?? [];
-    this.center = center?.() ?? [];
-    this.default = d?.() ?? [];
+    const noop = () => []
+    const { left, right, center, default: d } = this.$slots
+    this.left = left ?? noop
+    this.right = right ?? noop
+    this.center = center ?? noop
+    this.default = d ?? noop
   },
   methods: {
     onShowing() {
       useBasicStore().$patch(({ navbar }) => {
-        navbar.left.set(this.id, this.left);
-        navbar.right.set(this.id, this.right);
-        navbar.center.set(this.id, this.center);
-        navbar.cursor++;
-      });
+        navbar.left.set(this.id, this.left)
+        navbar.right.set(this.id, this.right)
+        navbar.center.set(this.id, this.center)
+        navbar.cursor++
+      })
     },
     onHide() {
       useBasicStore().$patch(({ navbar }) => {
-        navbar.left.delete(this.id);
-        navbar.right.delete(this.id);
-        navbar.center.delete(this.id);
-        navbar.cursor++;
-      });
+        navbar.left.delete(this.id)
+        navbar.right.delete(this.id)
+        navbar.center.delete(this.id)
+        navbar.cursor++
+      })
     }
-  },
+  }
 })
-
 </script>
diff --git a/src/components/NavContainer.ts b/src/components/NavContainer.ts
new file mode 100644
index 0000000..132af42
--- /dev/null
+++ b/src/components/NavContainer.ts
@@ -0,0 +1,81 @@
+import { useBasicStore } from '@/store/basic'
+import {Comment} from "@vue/runtime-core";
+import { v4 } from 'uuid'
+import type {Prop, VNode} from 'vue'
+import {defineComponent} from 'vue'
+
+export default defineComponent({
+  name: 'NavContainer',
+  props: {
+    align: {
+      type: String,
+      required: false,
+      default: 'left'
+    } as Prop<'left' | 'center' | 'right' | undefined>
+  },
+  data() {
+    return {
+      left: () => [] as VNode[],
+      right: () => [] as VNode[],
+      center: () => [] as VNode[],
+      default: () => [] as VNode[],
+      id: v4(),
+      show: false
+    }
+  },
+  watch: {
+    align(value: 'left' | 'center' | 'right' = 'left', old: string) {
+      if (!this.show || value === old) return;
+      const noop = () => [];
+      this.left = this.right = this.center = noop;
+      this[value] = this.$slots['default'] ?? noop;
+      useBasicStore().$patch(({ navbar }) => {
+        navbar.left.set(this.id, this.left)
+        navbar.right.set(this.id, this.right)
+        navbar.center.set(this.id, this.center)
+        navbar.cursor++
+      })
+    }
+  },
+  mounted() {
+    this[this.align!] = this.$slots['default'] ?? (() => []);
+    this.onShowing()
+  },
+  activated() {
+    this.onShowing()
+  },
+  beforeUnmount() {
+    this.onHide()
+  },
+  deactivated() {
+    this.onHide()
+  },
+  created() {
+    const noop = () => []
+    const { default: d } = this.$slots
+    this.default = d ?? noop
+  },
+  methods: {
+    onShowing() {
+      this.show = true
+      useBasicStore().$patch(({ navbar }) => {
+        navbar.left.set(this.id, this.left)
+        navbar.right.set(this.id, this.right)
+        navbar.center.set(this.id, this.center)
+        navbar.cursor++
+      })
+    },
+    onHide() {
+      this.show = false
+      useBasicStore().$patch(({ navbar }) => {
+        navbar.left.delete(this.id)
+        navbar.right.delete(this.id)
+        navbar.center.delete(this.id)
+        navbar.cursor++
+      })
+    }
+  },
+  render(){
+    return h(Comment, "nav container");
+  }
+})
diff --git a/src/store/basic.ts b/src/store/basic.ts
index 7b949ce..556e0d6 100644
--- a/src/store/basic.ts
+++ b/src/store/basic.ts
@@ -36,9 +36,9 @@ export const useBasicStore = defineStore('basic', {
       settings: defaultSettings,
       navbar: {
         cursor: 0,
-        left: new Map<string, VNode[]>(),
-        right: new Map<string, VNode[]>(),
-        center: new Map<string, VNode[]>()
+        left: new Map<string, () => VNode[]>(),
+        right: new Map<string, () => VNode[]>(),
+        center: new Map<string, () => VNode[]>()
       }
     }
   },