Container that shows or hides its content with a single header click.

Reference → Controls → Viewer → Expander

The Expander control belongs to the Viewer category and runs on the Portable rendering target. Place it on a Display from the Components Panel and configure the properties listed below.

Properties

Property set auto-extracted from ControlSchemas.json (build fx-10.1.5.2000, schema 1.0, generated 2026-05-17T21:29:29.5050227Z).

Property

Type

Default

Description

Left

Double

0

X position from left edge (unit: pixels)

Top

Double

0

Y position from top edge (unit: pixels)

Width

Double

100

Element width (unit: pixels)

Height

Double

100

Element height (unit: pixels)

CollapsedWidth

Double

120.0

(no description in schema)

CollapsedSize

Object

(none)

(no description in schema)

OriginalSize

Object

(none)

(no description in schema)

EnableScrollBar

Boolean

(none)

(no description in schema)

Settings

String

(none)

(no description in schema)

LinkedValue

String

(none)

Tag binding expression (e.g., '@Tag.Temperature', '@Tag.Motor.Speed'). On ComboBox in DataTable/FK mode, receives the SelectedValuePath column value from the selected row.

LabelLink

String

(none)

Label/caption text — static string or tag expression (e.g., 'Temperature' or '@Tag.Description')

LabelMethodList

String

(none)

(no description in schema)

LabelPreviewMode

Enum

0

Design-time label preview (LinkedTags, Placeholder, Whitespace)

Localize

Boolean

False

Enable runtime text localization (true/false)

HeaderHeight

Double

26.0

(no description in schema)

ContentHeight

Double

100.0

(no description in schema)

Background

Color

(none)

Background color (#AARRGGBB). Themed by default — OMIT to use theme.

Foreground

Color

(none)

Text/foreground color (#AARRGGBB). Themed by default — OMIT to use theme.

BorderBrush

Color

(none)

Border color (#AARRGGBB).

BorderThickness

String

(none)

Border thickness (single value or 'left,top,right,bottom').

In this section...

  • No labels