Flash tab issue

<Window x:Class="actiproColorAnime.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:shared="http://schemas.actiprosoftware.com/winfx/xaml/shared"     
        xmlns:docking="http://schemas.actiprosoftware.com/winfx/xaml/docking" 
        xmlns:local="clr-namespace:ActiProMdiTest"
        Title="MainWindow" Height="350" Width="525">
    <docking:DockSite>
        <docking:SplitContainer Orientation="Vertical">
            <docking:ToolWindowContainer>
                <docking:ToolWindow Name="ToolWindow1" Title="ToolWindow1" local:ToolWindowTabFlashBehavior.IsFlashing="True" local:ToolWindowTabFlashBehavior.IsStoppedWhenActivated="False"/>
            </docking:ToolWindowContainer>

            <docking:ToolWindowContainer>
                <docking:ToolWindow Name="ToolWindow2" Title="ToolWindow2" local:ToolWindowTabFlashBehavior.IsFlashing="True" local:ToolWindowTabFlashBehavior.IsStoppedWhenActivated="False"/>
            </docking:ToolWindowContainer>
        </docking:SplitContainer>
    </docking:DockSite>
</Window>