[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 the KaxToolBar dropdown items - KaxToolBarDropDown and KaxToolBarSplitButton. You can specify the Type and the Duration of the expand animation. 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:KaxToolBar ID="KaxToolBar1" runat="server">

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

<Items>

<kettic:KaxToolBarDropDown Text="Insert Html Element" >

<Buttons>

<kettic:KaxToolBarButton Text="Image" />

<kettic:KaxToolBarButton Text="Editable Div element" />

</Buttons>

</kettic:KaxToolBarDropDown>

<kettic:KaxToolBarSplitButton Text="Insert Form Element" >

<Buttons>

<kettic:KaxToolBarButton Text="Button" />

<kettic:KaxToolBarButton Text="TextBox" />

<kettic:KaxToolBarButton Text="TextArea" />

<kettic:KaxToolBarButton Text="CheckBox" />

<kettic:KaxToolBarButton Text="RadioButton" />

</Buttons>

</kettic:KaxToolBarSplitButton>

</Items>

</kettic:KaxToolBar>

void Page_Load(object sender, EventArgs e)
{
    KaxToolBar1.ExpandAnimation.Type = AnimationType.Linear;
    KaxToolBar1.ExpandAnimation.Duration = 300;
}

Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
    KaxToolBar1.ExpandAnimation.Type = AnimationType.Linear
    KaxToolBar1.ExpandAnimation.Duration = 300
End Sub

Reference