refactoring: fix basic flow to add a new point

UI/Test.svelte

@@ -0,0 +1,18 @@
+<script lang="ts">
+  // Testing grounds
+  import { UIEventSource } from "../Logic/UIEventSource";
+  import TabbedGroup from "./Base/TabbedGroup.svelte";
+
+  let tab = new UIEventSource(1)
+  console.log("Tab control", tab)
+
+</script>
+
+<TabbedGroup {tab}>
+  <div slot="title0">Title 0</div>
+  <div slot="content0">Content 0 loaded</div>
+
+  <div slot="title1">Title 1</div>
+  <div slot="content1">Content 1</div>
+
+</TabbedGroup>