[PersistenceModeAttribute(PersistenceMode.InnerProperty)]
public AnimationSettings ExpandAnimation { get; }

<PersistenceModeAttribute(PersistenceMode.InnerProperty)> 
Public ReadOnly Property ExpandAnimation As AnimationSettings
	Get

public:
[PersistenceModeAttribute(PersistenceMode::InnerProperty)]
property AnimationSettings^ ExpandAnimation {
	AnimationSettings^ get ();
}

[<PersistenceModeAttribute(PersistenceMode.InnerProperty)>]
member ExpandAnimation : AnimationSettings with get

Property Value

Use the ExpandAnimation property to customize the expand animation of KaxTreeView. You can specify the Type and Duration. To disable expand animation effects you should set the Type to AnimationType.None.
To customize the collapse animation you can use the CollapseAnimation property.

ASPX:

<kettic:KaxTreeView ID="KaxTreeView1" runat="server">

<ExpandAnimation Type="OutQuint" Duration="300" />

<Nodes>

<kettic:KaxTreeViewNode Text="News" >

<Nodes>

<kettic:KaxTreeViewNode Text="CNN" NavigateUrl="http://www.cnn.com" />

<kettic:KaxTreeViewNode Text="Google News" NavigateUrl="http://news.google.com" />

</Nodes>

</kettic:KaxTreeViewNode>

<kettic:KaxTreeViewNode Text="Sport" >

<Nodes>

<kettic:KaxTreeViewNode Text="ESPN" NavigateUrl="http://www.espn.com" />

<kettic:KaxTreeViewNode Text="Eurosport" NavigateUrl="http://www.eurosport.com" />

</Nodes>

</kettic:KaxTreeViewNode>

</Nodes>

</kettic:KaxTreeView>

void Page_Load(object sender, EventArgs e)
{
    KaxTreeView1.ExpandAnimation.Type = AnimationType.Linear;
    KaxTreeView1.ExpandAnimation.Duration = 300;
}

Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
    KaxTreeView1.ExpandAnimation.Type = AnimationType.Linear
    KaxTreeView1.ExpandAnimation.Duration = 300
End Sub

Reference