PropertyGridControl.CustomExpand Event

Enables you to control how properties and categories expand.

Namespace: DevExpress.Xpf.PropertyGrid

Assembly: DevExpress.Xpf.PropertyGrid.v21.2.dll


public event CustomExpandEventHandler CustomExpand

Event Data

The CustomExpand event's data class is CustomExpandEventArgs. The following properties provide information specific to this event:

Property Description
Handled Gets or sets a value that indicates the present state of the event handling for a routed event as it travels the route. Inherited from RoutedEventArgs.
IsExpanded Gets or sets whether the item is expanded.
IsInitializing Gets whether the item is being initialized.
OriginalSource Gets the original reporting source as determined by pure hit testing, before any possible Source adjustment by a parent class. Inherited from RoutedEventArgs.
RoutedEvent Gets or sets the RoutedEvent associated with this RoutedEventArgs instance. Inherited from RoutedEventArgs.
Row Gets information about an expanding row.
Source Gets or sets a reference to the object that raised the event. Inherited from RoutedEventArgs.

The event data class exposes the following methods:

Method Description
InvokeEventHandler(Delegate, Object) When overridden in a derived class, provides a way to invoke event handlers in a type-specific way, which can increase efficiency over the base implementation. Inherited from RoutedEventArgs.
OnSetSource(Object) When overridden in a derived class, provides a notification callback entry point whenever the value of the Source property of an instance changes. Inherited from RoutedEventArgs.


Handle the CustomExpand event to expand a row (or category). This event fires for each PropertyGridControl item. Set the event arguments’ CustomExpandEventArgs.IsExpanded property to true to expand a processed item.

When the CustomExpandEventArgs.IsExpanded property is set to true, end-users cannot collapse items in the PropertyGridControl. Set the IsExpanded property to true only if the processed item is initializing (CustomExpandEventArgs.IsInitializing is true) to allow end-users to collapse the control items.

The code sample below demonstrates how to expand all the items within the control and allow end-users to collapse them:

void PropertyGridControl_CustomExpand(object sender, CustomExpandEventArgs args) {
        args.IsExpanded = true;
See Also