diff --git a/vuu-ui/packages/vuu-data-ag-grid/src/ViewportRowModelDataSource.ts b/vuu-ui/packages/vuu-data-ag-grid/src/ViewportRowModelDataSource.ts
index decca8b38..d453c96e4 100644
--- a/vuu-ui/packages/vuu-data-ag-grid/src/ViewportRowModelDataSource.ts
+++ b/vuu-ui/packages/vuu-data-ag-grid/src/ViewportRowModelDataSource.ts
@@ -85,6 +85,7 @@ export class ViewportRowModelDataSource {
       if (itemsOrOrderChanged(this.columns, columns)) {
         this.columns = columns;
         this.columnMap = buildColumnMap(columns);
+        this.reverseColumnMap = reverseColumnMap(this.columnMap);
       }
     }
   };
diff --git a/vuu-ui/packages/vuu-data-local/src/array-data-source/array-data-source.ts b/vuu-ui/packages/vuu-data-local/src/array-data-source/array-data-source.ts
index 0325a4477..66e911d13 100644
--- a/vuu-ui/packages/vuu-data-local/src/array-data-source/array-data-source.ts
+++ b/vuu-ui/packages/vuu-data-local/src/array-data-source/array-data-source.ts
@@ -6,6 +6,7 @@ import {
   DataSourceFilter,
   DataSourceRow,
   DataSourceStatus,
+  DataSourceSubscribedMessage,
   MenuRpcResponse,
   Selection,
   SubscribeCallback,
@@ -216,13 +217,15 @@ export class ArrayDataSource
       };
     }
 
-    this.clientCallback?.({
+    const subscribedMessage: DataSourceSubscribedMessage = {
       ...config,
       type: "subscribed",
       clientViewportId: this.viewport,
       range: this.#range,
       tableSchema: this.tableSchema,
-    });
+    };
+    this.clientCallback?.(subscribedMessage);
+    this.emit("subscription-open", subscribedMessage);
 
     if (hasConfigProps) {
       // invoke setter to action config
diff --git a/vuu-ui/packages/vuu-data-remote/src/vuu-data-source.ts b/vuu-ui/packages/vuu-data-remote/src/vuu-data-source.ts
index 4308175df..a56934b75 100644
--- a/vuu-ui/packages/vuu-data-remote/src/vuu-data-source.ts
+++ b/vuu-ui/packages/vuu-data-remote/src/vuu-data-source.ts
@@ -191,6 +191,7 @@ export class VuuDataSource
       this.#status = "subscribed";
       this.tableSchema = message.tableSchema;
       this.clientCallback?.(message);
+      this.emit("subscription-open", message);
     } else if (message.type === "disabled") {
       this.#status = "disabled";
     } else if (message.type === "enabled") {
diff --git a/vuu-ui/packages/vuu-data-types/index.d.ts b/vuu-ui/packages/vuu-data-types/index.d.ts
index 665003c9f..a9eb5e2c8 100644
--- a/vuu-ui/packages/vuu-data-types/index.d.ts
+++ b/vuu-ui/packages/vuu-data-types/index.d.ts
@@ -339,6 +339,7 @@ export type DataSourceEvents = {
   optimize: (optimize: OptimizeStrategy) => void;
   range: (range: VuuRange) => void;
   resize: (size: number) => void;
+  "subscription-open": (subscription: DataSourceSubscribedMessage) => void;
 };
 
 /**