how to textbox is transparent with background color when you click into the textbox

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XAML

Windows-Phone-7

C#5.0

Hi,

i am working on wndows phone8.1 app, i am new to the windows development.can anyone help me.

How to textbox is transparent with background color when you click in that textbox for entering the text,but i am getting the white color text.here is the of my coding.

<textbox x:name="TextBox" xmlns:x="#unknown">
HorizontalAlignment="Left"
Margin="175,267,0,0"
TextWrapping="Wrap"
PlaceholderText="search contacts"
VerticalAlignment="Top"
Background="White"
BorderBrush="White"
Foreground="Black"/>

i used the above code but i am not getting the transparent textbox with background color, how can i get it.please any one help me.

Thanks,
yvreddy.