Created Issue: :datepicker background white color when click and hold control. [11165]

Hi all, m new in windows phone 7.My issue is when we click and hold on toolkit:DatePicker control then white color show.I want to show the background image(Images/plus_green.png) which i have set in xaml when user click and hold on datepicker.Below is our xaml code.

<toolkit:DatePicker HorizontalAlignment="Left" Margin="37,0,0,0" Name="datePicker1" VerticalAlignment="Top" Grid.Column="5" Width="74" Foreground="White" Value="" BorderBrush="#FFF8F2F2" UseLayoutRounding="True" FontSize="1" >
<toolkit:DatePicker.Background>
<ImageBrush ImageSource="Images/plus_green.png" Stretch="Fill" />
</toolkit:DatePicker.Background>
</toolkit:DatePicker>

how can achieve this.Pls help me.

Thanx in advance.

From forum http://social.msdn.microsoft.com/Forums/en-US/wpdevelop/thread/45386186-11d3-4394-8d4e-21b2fa4dbdab