Implementing .NET MAUI Expander (SfExpander)

The Syncfusion .NET MAUI Expander control provides collapsible and expandable content sections for creating space-efficient layouts. Users can tap headers to reveal or hide content with smooth animations, making it ideal for accordion layouts, FAQs, and organized data displays.

When to Use This Skill

Use this skill when you need to:

• Implement collapsible sections for space-efficient layouts and organized content display
• Create accordion-style interfaces for FAQs, settings panels, or grouped data
• Build invoice or receipt views with expandable sections (date, items, payment, address)
• Design dynamic header/content layouts where users tap to reveal more information
• Add animated expand/collapse functionality with customizable duration and easing
• Handle expand/collapse events for controlling user interactions and state management
• Customize header appearance with backgrounds, icon positions, and Visual State Manager styling
• Apply modern liquid glass effects for premium translucent designs in high-end applications

Component Overview

• Interactive expand/collapse with single tap on header
• Fully customizable header and content view layouts
• Smooth animations with configurable duration and easing
• Event system for Expanding, Expanded, Collapsing, and Collapsed states
• Programmatic control via IsExpanded property
• Visual State Manager support for dynamic styling
• Header appearance customization (background, icon position, colors)
• Modern liquid glass effects (.NET 10+, macOS 26+, iOS 26+)
• Event cancellation for Expanding and Collapsing actions
• Platform-optimized rendering and animations

Documentation and Navigation Guide

Getting Started

📄 Read: references/getting-started.md

When to read: First-time setup, installation, basic implementation

• Installing Syncfusion.Maui.Expander NuGet package
• Registering Syncfusion handler (ConfigureSyncfusionCore)
• Creating basic SfExpander instance
• Defining Header and Content views
• Using IsExpanded property to control initial state
• Complete invoice example with multiple expanders
• Running your first expander application

Header and Content Customization

📄 Read: references/header-content-customization.md

When to read: Customizing header and content sections with layouts and views

• Loading any UI view in Header and Content properties
• Using Grid layouts with icons and labels
• Icon integration with font families
• Multi-expander layouts (invoice with multiple sections)
• Best practices for content structure
• Avoiding common pitfalls (Label wrapping in containers)

Animation and Events

📄 Read: references/animation-events.md

When to read: Controlling animation behavior and handling expand/collapse events

• AnimationDuration property (default: 300ms)
• AnimationEasing property (Linear, SinOut, etc.)
• Programmatic control with IsExpanded property
• Expanding event: Triggered before expansion (cancellable)
• Expanded event: Triggered after expansion completes
• Collapsing event: Triggered before collapse (cancellable)
• Collapsed event: Triggered after collapse completes
• Event handler examples with cancellation logic

Appearance and Styling

📄 Read: references/appearance-styling.md

When to read: Customizing header appearance, colors, icons, and Visual State Manager styling

• HeaderIconPosition property (Start, End)
• HeaderBackground color customization
• HeaderIconColor customization
• Visual State Manager (VSM) states: Expanded, Collapsed, PointerOver, Normal
• Dynamic appearance changes based on expander state
• Complete VSM examples with color transitions

Liquid Glass Effect

📄 Read: references/liquid-glass-effect.md

When to read: Applying modern translucent designs with adaptive color tinting

• When to use liquid glass effect (premium UX applications)
• Wrapping SfExpander inside SfGlassEffectView
• Setting EnableLiquidGlassEffect="True" on expander
• Using Background="Transparent" for glass effect
• Complete invoice example with liquid glass
• Platform requirements: .NET 10+, macOS 26+, iOS 26+
• Multiple expanders with consistent glass effect