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8f025ac679
Reconcile the read-only guidance output with the machine-readable skill index, adopt linked sample references required by bounded retrieval, and update the guidance regression fixture for the retrieval helper dependency. Permit only the known endpoint-DLP metadata stream during read-only evidence capture. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Copilot-Session: 638b66d2-9f06-4f60-8781-808709e1485c
30 lines
1.5 KiB
Markdown
30 lines
1.5 KiB
Markdown
---
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bc-version: [all]
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domain: ui
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keywords: [fieldgroup, dropdown, addlast, lookup-page, visible, tableextension, pageextension]
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technologies: [al]
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countries: [w1]
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application-area: [all]
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---
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# A `DropDown` field remains hidden when its lookup-page control is hidden
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## Description
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A tableextension can append a field to the `DropDown` field group with `addlast`, but the client still omits that field when its control on the underlying lookup page has `Visible = false`. Changing only the table field group therefore compiles while producing no visible UI change. The field-group name is case-sensitive and must be written as `DropDown`.
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## Best Practice
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When adding a hidden field to a `DropDown` field group, also extend the page used for the lookup and make that field control visible. Verify the actual lookup page rather than assuming the table definition alone controls the drop-down.
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See sample: [`dropdown-fieldgroup-respects-lookup-page-visibility.good.al`](dropdown-fieldgroup-respects-lookup-page-visibility.good.al).
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## Anti Pattern
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Adding the field with `addlast(DropDown; ...)` while leaving its lookup-page control hidden, then expecting the field to appear in the drop-down.
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See sample: [`dropdown-fieldgroup-respects-lookup-page-visibility.bad.al`](dropdown-fieldgroup-respects-lookup-page-visibility.bad.al).
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## Reference
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[Add a new FieldGroup to an existing table](https://learn.microsoft.com/en-us/training/modules/extend-modify-existing-table/add-field-group)
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