ALTER PAGE can't target datagrid columns

[ako]

Description

INSERT AFTER / DROP WIDGET on datagrid column names fails with "widget not found" — columns inside a DATAGRID aren't addressable as widgets. The only workaround is to CREATE OR REPLACE the entire page to add or remove a column.

Example

-- This fails: columns aren't addressable
ALTER PAGE MyModule.ProductList
  INSERT AFTER dgProducts.Description {
    COLUMN Edit (Attribute: ID, OnClick: SHOW_PAGE MyModule.Product_Edit)
  };

Workaround

Recreate the entire page with CREATE OR MODIFY PAGE including the new column.

Suggested Fix

Make datagrid columns addressable in ALTER PAGE, e.g.:

• ALTER DATAGRID dgProducts INSERT COLUMN ...
• Or make column names addressable as dgProducts.ColumnName

Impact

Medium — forces full page rewrites for single-column changes in grids.

[github-actions]

Issue Triage

Summary:
The user requests a way to add or remove columns in a datagrid via ALTER PAGE without having to recreate the entire page.

Checklist for feature request

Required info	Present?	Details
Use case – why the feature is needed	✅	Described: avoids full page rewrites for single‑column changes in grids.
Proposed syntax or behavior (if applicable)	✅	Suggested: ALTER DATAGRID dgProducts INSERT COLUMN … or addressable column names like dgProducts.ColumnName.
Mendix version relevance (if version‑specific)	❌	Not mentioned whether the issue applies to specific Mendix versions.

Next steps
Could you let us know which Mendix version(s) you’re targeting (e.g., 9.x, 10.x) so we can assess version‑specific implications? If the feature should work across all recent versions, just confirming that would be helpful. Thanks for the clear request!

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