Silverlight/WPF Object Tree and Visual Tree

The hierarchical tree of objects in XAML file starting from the root going all the way down to elements make up the Object Tree. Object tree contains all types regardless of whether they participate in rending.

Visual Tree is a filtered view of Object Tree containing only those elements with a visual representation.

Silverlight, WPF Brushes

SolidColorBrush LinearGradientBrush and RadialGradientBrush

<Rectangle Height="94" HorizontalAlignment="Left" Margin="57,42,0,0" Name="rectangle1" Stroke="Black" StrokeThickness="1" VerticalAlignment="Top" Width="201">
<Rectangle.Fill>
    <SolidColorBrush Color="Blue"/>
  
</Rectangle.Fill>

</Rectangle>
<Rectangle Height="92" HorizontalAlignment="Left" Margin="309,41,0,0" Name="rectangle2" Stroke="Black" StrokeThickness="1" VerticalAlignment="Top" Width="210">
<Rectangle.Fill>
    <LinearGradientBrush>
        <GradientStop Color="Blue" Offset="0"/>
        <GradientStop Color="Red" Offset="1"/>
    </LinearGradientBrush>
</Rectangle.Fill>
</Rectangle>

<Rectangle Height="80" HorizontalAlignment="Left" Margin="58,172,0,0" Name="rectangle3" Stroke="Black" StrokeThickness="1" VerticalAlignment="Top" Width="201">
<Rectangle.Fill>
    <RadialGradientBrush>
        <GradientStop Color="Blue" Offset="0"/>
        <GradientStop Color="Red" Offset="1"/>
    </RadialGradientBrush>
</Rectangle.Fill>
</Rectangle>
</Grid>