Setting styles don't work for me?

Question

I've just started using Silverlight 3.0 and am wondering if this isn't available in 3.0. It seems despite all the examples I've come across, I can't seem to set styles.

The code below gives me the following error: The tag 'Type' does not exist in XML namespace | And it underlines the TargetType attribute in the Style element. Any help would be appreciated.

<UserControl xmlns:controls="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls"  xmlns:dataInput="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data.Input"  x:Class="MultiSelectFileUploader.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
    mc:Ignorable="d" d:DesignWidth="640" d:DesignHeight="480">
    <UserControl.Resources>
        <Style x:Key="ButtonStyle" TargetType="{x:Type Button}">
            <Setter Property="Width" Value="150" />
            <Setter Property="Margin" Value="0 0 250 0" />
        </Style>
    </UserControl.Resources>


    <Grid x:Name="LayoutRoot">
        <Grid.RowDefinitions>
            <RowDefinition Height="100" />
        </Grid.RowDefinitions>

        <controls:TabControl>
            <controls:TabItem Header="Upload Files">
                <!--<Button x:Name="btnBrowse" Grid.Row="0" Width="150" Margin="0 0 250 0" Content="Browse" Click="btnBrowse_Click" />-->
                <Button Style="{StaticResource ButtonStyle}" x:Name="btnBrowse" Grid.Row="0" Content="Browse" Click="btnBrowse_Click" />
            </controls:TabItem>
            <controls:TabItem Header="View Files" >


            </controls:TabItem>

        </controls:TabControl>
    </Grid>
</UserControl>

Answer 1

Change TargetType="{x:Type Button}" to TargetType="Button"

Silverlight 3 does not support the WPF TargetType syntax you are using.