diff --git a/lib/custom-elements-languageserver-core/src/scanners/action-context.ts b/lib/custom-elements-languageserver-core/src/scanners/action-context.ts
index 0d57873..dbda026 100644
--- a/lib/custom-elements-languageserver-core/src/scanners/action-context.ts
+++ b/lib/custom-elements-languageserver-core/src/scanners/action-context.ts
@@ -88,7 +88,7 @@ function resolveAttributeKind(attributeName: string, currentTag: string, textSpa
         } as EventActionContext;
     }
 
-    if (attributeName.startsWith(".")) {
+    if (attributeName.startsWith(".") || attributeName.startsWith(":")) {
         return {
             kind: ActionContextKind.PropertyName,
             propertyName: attributeName.substring(1),
diff --git a/usage-testing-project/src/fast-component.ts b/usage-testing-project/src/fast-component.ts
new file mode 100644
index 0000000..64ccb08
--- /dev/null
+++ b/usage-testing-project/src/fast-component.ts
@@ -0,0 +1,69 @@
+import {
+  FASTElement,
+  customElement,
+  attr,
+  observable,
+  Observable,
+  html,
+  repeat
+} from "@microsoft/fast-element";
+
+const template = html<NameTag>`<div>
+  <h2>Hello!</h2>
+  <p>I am ${(x) => x.name}. I enjoy:</p>
+  <ul>
+    ${repeat(
+  (x) => x.hobbies,
+  html`<li>
+        ${(hobby) => {
+      return hobby;
+    }}
+      </li> `
+)}
+  </ul>
+  <fast-button @click=${(x) => x.onDelete()}>Delete</fast-button>
+</div>`;
+
+@customElement({ name: "name-tag", template })
+export class NameTag extends FASTElement {
+  @attr() name: string = "John Doe";
+
+  @attr() foo: string = "Bar";
+
+  /**
+   * Color of project card background and general theme
+   * */
+  @attr() color: string = "#000000";
+
+  @observable() data: any;
+
+  @observable() hobbies: string[] = ["1", "2", "3"];
+
+  connectedCallback() {
+    super.connectedCallback();
+    const test = ["test1", "test2", "test3"];
+    // this.hobbies = ["tom", "jerry", "dave"];
+    this.hobbies = test;
+    // const notifier = Observable.getNotifier(this.hobbies);
+    // const handler = {
+    //   handleChange(source: any, splices: any) {
+    //     console.log("WORKING", source, splices);
+    //     // respond to the change here
+    //     // source will be the array instance
+    //     // splices will be an array of change records
+    //     // describing the mutations in the array in
+    //     // terms of splice operations
+    //   }
+    // };
+    // notifier.subscribe(handler);
+  }
+
+  // hobbiesChanged() {
+  //   console.log("changed hobbies", this.hobbies);
+  // }
+
+  public onDelete = () => {
+    this.hobbies.splice(0, 1);
+  };
+}
+
diff --git a/usage-testing-project/src/fast.ts b/usage-testing-project/src/fast.ts
new file mode 100644
index 0000000..dc5ca26
--- /dev/null
+++ b/usage-testing-project/src/fast.ts
@@ -0,0 +1,8 @@
+import {
+  html
+} from "@microsoft/fast-element";
+import "./fast-component.js";
+
+const temp = html`
+  <name-tag :foo=""></name-tag>
+`
\ No newline at end of file