SHOW_PAGE with parameter binding generates invalid expression (CE0117)

[engalar]

Bug

SHOW_PAGE with $currentObject parameter binding in DATAGRID CONTROLBAR generates an invalid Mendix expression, causing CE0117.

MDL input

DATAGRID dgOrders (DataSource: DATABASE FROM MyModule.Order, Selection: Single) {
  CONTROLBAR cb {
    ACTIONBUTTON btnView (
      Caption: 'View',
      Action: SHOW_PAGE MyModule.Order_Detail(OrderParam: \$currentObject),
      ButtonStyle: Primary
    )
  }
  COLUMN colNum (Attribute: OrderNumber, Caption: 'Order')
}

Result

mxcli creates the page and button, but `mx check` reports:

```
CE0117 Error(s) in expression. Action button 'btnView' Page 'Order_Overview'
```

The generated parameter binding expression for `$currentObject` is invalid in the Mendix model.

Expected

The button should correctly pass the selected DATAGRID row to the target page parameter.

[engalar]

[engalar]

Update: Root cause identified

The issue is not with `$currentObject` per se — it's that inside a DATAGRID CONTROLBAR, there is no DataView context, so `$currentObject` is undefined.

Correct approach

When DATAGRID has `Selection: Single`, the selected row is accessible via the widget name as a variable:

DATAGRID dgOrders (DataSource: DATABASE FROM MyModule.Order, Selection: Single) {
  CONTROLBAR cb {
    ACTIONBUTTON btnView (
      Caption: 'View',
      -- Use \$dgOrders (widget name), NOT \$currentObject
      Action: SHOW_PAGE MyModule.Order_Detail(OrderParam: \$dgOrders),
      ButtonStyle: Primary
    )
  }
}

Suggestion

mxcli should either:

1. Reject `$currentObject` in CONTROLBAR context with a clear error message pointing to the widget name variable
2. Auto-resolve `$currentObject` to the DATAGRID widget name when inside a CONTROLBAR