LookUpEditBase.ItemsPanel Property

Gets or sets the template that defines the panel that controls the layout of items displayed within the editor’s dropdown. This is a dependency property.

Namespace : DevExpress.Xpf.Editors

Assembly : DevExpress.Xpf.Core.v25.2.dll

NuGet Package : DevExpress.Wpf.Core

csharp

[Browsable(false)]
public ItemsPanelTemplate ItemsPanel { get; set; }

<Browsable(False)>
Public Property ItemsPanel As ItemsPanelTemplate

Property Value

Type	Description
ItemsPanelTemplate

A ItemsPanelTemplate object that represents the panel to use for the layout of the items.

Remarks

By default, the layout of items is defined by the DevExpress.Xpf.Core.DXVirtualizingStackPanel control with the enabled virtualization. In this instance, vertical scrolling is performed item by item. To activate per-pixel scrolling, do the following:

XAML

xaml

<dxe:ComboBoxEdit Name="cbEdit1"
                    Width="150" PopupHeight="100"
                    ScrollViewer.CanContentScroll="False"/>

See the ItemsPanel topic for more information.

Example

This example shows how to speed up the editor’s performance if it is bound to a large data source.

C#
XAML

csharp

public MainWindow() {
    InitializeComponent();
    comboBoxEdit1.ItemsSource = GenerateData();
}

private List<string> GenerateData() {
    List<string> list = new List<string>();
    for (int i = 0; i < 2000; i++)
        list.Add(i.ToString());
    return list;
}

xaml

<dxe:ComboBoxEdit Name="comboBoxEdit1" Width="170"
                    HorizontalAlignment="Left" VerticalAlignment="Top">
    <dxe:ComboBoxEdit.ItemsPanel>
        <ItemsPanelTemplate>
            <VirtualizingStackPanel/>
        </ItemsPanelTemplate>
    </dxe:ComboBoxEdit.ItemsPanel>
</dxe:ComboBoxEdit>