Here is the complete code of
MainPage.xaml
file
<phone:PhoneApplicationPage
x:Class="CustomBackground.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"
xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
d:DesignWidth="480"
d:DesignHeight="768"
FontFamily="{StaticResource
PhoneFontFamilyNormal}"
FontSize="{StaticResource
PhoneFontSizeNormal}"
Foreground="{StaticResource
PhoneForegroundBrush}"
SupportedOrientations="Portrait"
Orientation="Portrait"
shell:SystemTray.IsVisible="True">
<Grid
x:Name="PhoneBackGround"
Background="Transparent">
<TextBlock
Height="69"
HorizontalAlignment="Left"
Margin="12,31,0,0"
Name="textBlock1"
Text="Welcome
to Custom Background Application"
FontSize="22"
VerticalAlignment="Top"
Width="444"
/>
<TextBlock
Height="30"
HorizontalAlignment="Left"
Margin="12,82,0,0"
Name="textBlock2"
Text="Choose
Back Ground Color"
VerticalAlignment="Top"
Width="381"
/>
<RadioButton
Content="Blue"
Height="72"
HorizontalAlignment="Left"
Margin="0,118,0,0"
Name="BlueButton"
VerticalAlignment="Top"
BorderThickness="0"
FontSize="22"
Checked="BlueButton_Checked"
/>
<RadioButton
Content="Green"
Height="72"
HorizontalAlignment="Left"
Margin="0,168,0,0"
Name="GreenButton"
VerticalAlignment="Top"
BorderThickness="0"
FontSize="22"
Checked="GreenButton_Checked"
/>
<RadioButton
Content="Brown"
Height="72"
HorizontalAlignment="Left"
Margin="0,216,0,0"
Name="BrownButton"
VerticalAlignment="Top"
BorderThickness="0"
FontSize="22"
Checked="BrownButton_Checked"
/>
<RadioButton
Content="Orange"
Height="72"
HorizontalAlignment="Left"
Margin="0,265,0,0"
Name="OrangeButton"
VerticalAlignment="Top"
BorderThickness="0"
FontSize="22"
Checked="OrangeButton_Checked"
/>
<TextBlock
Height="56"
HorizontalAlignment="Left"
Margin="12,343,0,0"
Name="textBlock3"
Text="Choose
Image for Form BackGround"
VerticalAlignment="Top"
FontSize="22"
Width="422"
/>
<RadioButton
Content="Flower's"
Height="72"
HorizontalAlignment="Left"
Margin="1,375,0,0"
Name="FlowerButton"
VerticalAlignment="Top"
BorderThickness="0"
FontSize="22"
Checked="FlowerButton_Checked"
/>
<RadioButton
Content="Desert"
Height="72"
HorizontalAlignment="Left"
Margin="0,423,0,0"
Name="DesertButton"
VerticalAlignment="Top"
BorderThickness="0"
FontSize="22"
Checked="DesertButton_Checked"
/>
<Grid
Height="255"
HorizontalAlignment="Left"
Margin="12,501,0,0"
Name="LoginForm"
VerticalAlignment="Top"
Width="456">
<TextBlock
Height="30"
HorizontalAlignment="Left"
Margin="27,28,0,0"
Name="textBlock4"
Text="UserName"
VerticalAlignment="Top"
FontSize="25"
Foreground="Olive"
/>
<TextBlock
Height="30"
HorizontalAlignment="Left"
Margin="27,104,0,0"
Name="textBlock5"
Text="Password"
VerticalAlignment="Top"
FontSize="25"
Foreground="Olive"
/>
<TextBox
Height="72"
HorizontalAlignment="Right"
Margin="0,6,12,0"
Name="textBox1"
VerticalAlignment="Top"
Width="282"
Background="White" />
<PasswordBox
Height="72"
HorizontalAlignment="Left"
Margin="162,84,0,0"
Name="passwordBox1"
VerticalAlignment="Top"
Width="282"
Background="White"
/>
<Button
Content="OK"
Height="72"
HorizontalAlignment="Left"
Margin="162,162,0,0"
Name="button1"
VerticalAlignment="Top"
Width="160"
BorderThickness="0"
Background="Silver"
/>
</Grid>
</Grid>
</phone:PhoneApplicationPage>