WPF Form Designer Prototype (MVVM)

<UserControl x:Class="WPFFormDesigner.FormDesignerToolboxView" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:DragDrop="clr-namespace:FluidKit.Helpers.DragDrop;assembly=FluidKit" xmlns:DragDrop2="clr-namespace:WPFFormDesigner.WPFControlUtils.DragDrop" mc:Ignorable="d" d:DesignHeight="300" d:DesignWidth="300">
    <UserControl.Resources>
        <SolidColorBrush x:Key="ToolboxBackgroundBrush" Color="#FFE5DBB3" />
        <!--<SolidColorBrush x:Key="ExpanderBackgroundBrush" Color="#AAADC972" Opacity="1" />-->
        <SolidColorBrush x:Key="ExpanderBackgroundBrush" Color="#AAADC972" Opacity="1" />
        <DragDrop2:DefaultDragSourceAdvisor x:Key="sourceAdvisor" />
    </UserControl.Resources>
    <StackPanel Grid.Column="0">
        <Expander Header="WPF Form Controls" Background="{StaticResource ToolboxBackgroundBrush}" IsExpanded="True">
            <StackPanel x:Name="_topPanel" Background="{StaticResource ToolboxBackgroundBrush}" HorizontalAlignment="Center" DragDrop:DragDropManager.DragSourceAdvisor="{StaticResource sourceAdvisor}">
                <Rectangle Name="Border" StrokeThickness="1" StrokeDashArray="2" Fill="Transparent" SnapsToDevicePixels="true" />
                <Label Content="Label" Width="Auto" Height="Auto" Margin="3,7,3,7" ToolTip="Label" />
                <TextBox Width="75" Height="20" Margin="3,7,3,7" ToolTip="TextBox" />
                <CheckBox Content="Check Box" Width="Auto" Height="Auto" Margin="3,7,3,7" ToolTip="CheckBox" VerticalAlignment="Center" />
                <RadioButton Content="Radio Button" Height="Auto" Width="Auto" VerticalAlignment="Center" Margin="3,7,3,7" />
                <DatePicker Width="125" Height="25" Margin="3,7,3,7" ToolTip="DatePicker" />
                <ComboBox MinWidth="50" Width="150" Height="20" Margin="3,7,3,7" ToolTip="ComboBox" />
                <Expander ToolTip="Expander" Margin="10,10,10,10" Header="Expander">
                    <Border BorderBrush="#FF000000" BorderThickness="1,1,1,1" CornerRadius="8,8,8,8">
                        <!--<Grid Name="InnerGrid" ShowGridLines="True" HorizontalAlignment="Stretch" VerticalAlignment="Stretch">-->
                        <Grid ShowGridLines="True" HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="Auto" />
                                <ColumnDefinition Width="Auto" />
                                <ColumnDefinition Width="Auto" />
                                <ColumnDefinition Width="Auto" />
                                <ColumnDefinition Width="Auto" />
                                <ColumnDefinition Width="Auto" />
                                <ColumnDefinition Width="Auto" />
                            </Grid.ColumnDefinitions>
                            <Grid.RowDefinitions>
                                <RowDefinition Height="Auto" />
                            </Grid.RowDefinitions>
                        </Grid>
                    </Border>
                </Expander>
                <Button Content="ListView" ToolTip="ObservableCollection ListView" Margin="3,7,3,7" Tag="ObservableCollectionListView"/>
            </StackPanel>
        </Expander>
    </StackPanel>
</UserControl>