How to expand the popup of ColorPickerPalette at startup of Silverlight application?

<Window x:Class="NewText_WPfapplication.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:syncfusion="http://schemas.syncfusion.com/wpf"
Title="MainWindow" Height="350" Width="525">
<Grid x:Name="Grid1">
<syncfusion:ColorPickerPalette x:Name="color1" Width="200"  IsExpanded="True"/>
</Grid>
</Window>

using Syncfusion.Windows.Tools.Controls;
using Syncfusion.Windows.Shared;
 
namespace NewText_WPfapplication
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
ColorPickerPalette _colorpickerpalette = new ColorPickerPalette();
_colorpickerpalette.Width = 150;
_colorpickerpalette.IsExpanded = true;
Grid1.Children.Add(_colorpickerpalette);
}
}
}