ExpansionPanel Events

Updated on Oct 1, 2026

This article describes the available events in the Telerik ExpansionPanel for Blazor.

ExpandedChanged

The ExpansionPanel ExpandedChanged event fires when:

• The user expands or collapses the component.
• The app executes the component's ExpandAsync, CollapseAsync, or ToggleAsync method.

Make sure to update the value of the Expanded parameter by using the boolean argument that the event handler receives.

Using the ExpansionPanel events

Example

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See Also

• ExpansionPanel API Reference