Style inheritance issue mixing types - wpf

Question

I'm trying to factorize some styles with common properties.
So I'm using style inheritance but seems like it's not fully implemented.
Say I have these two styles:
<Style TargetType="ProgressBar">
<Setter Property="Height" Value="50"></Setter>
<Setter Property="Margin" Value="10"></Setter>
</Style>
<Style TargetType="Rectangle">
<Setter Property="Height" Value="50"></Setter>
<Setter Property="Margin" Value="10"></Setter>
</Style>
Here is my first try:
<Style x:Key="BaseStyle" TargetType="FrameworkElement">
<Setter Property="Height" Value="50"></Setter>
<Setter Property="Margin" Value="10"></Setter>
</Style>
<Style BasedOn="{StaticResource BaseStyle}" TargetType="ProgressBar"></Style>
<Style BasedOn="{StaticResource BaseStyle}" TargetType="Rectangle"></Style>
It's running but the Visual Studio designer is not happy and it displays this error:
Can only base on a Style with target type that is base type of this style's target type.
AFAIK if I trust MSDN both ProgressBar and Rectangle should inherit from FrameworkElement.
Here is the full code:
<StackPanel>
<StackPanel.Resources>
<!--<Style TargetType="ProgressBar">
<Setter Property="Height" Value="50"></Setter>
<Setter Property="Margin" Value="10"></Setter>
</Style>
<Style TargetType="Rectangle">
<Setter Property="Height" Value="50"></Setter>
<Setter Property="Margin" Value="10"></Setter>
</Style>-->
<Style x:Key="BaseStyle" TargetType="FrameworkElement">
<Setter Property="Height" Value="50"></Setter>
<Setter Property="Margin" Value="10"></Setter>
</Style>
<Style BasedOn="{StaticResource BaseStyle}" TargetType="ProgressBar"></Style>
<Style BasedOn="{StaticResource BaseStyle}" TargetType="Rectangle"></Style>
</StackPanel.Resources>
<ProgressBar Value="50"></ProgressBar>
<ProgressBar IsIndeterminate="True"></ProgressBar>
<Rectangle Width="100" Fill="BlueViolet"></Rectangle>
</StackPanel>
Note that the exact same code is working fine with WPF both in the designer and at runtime.
Is this a VS bug or a WinRT limitation?
Am I doing something wrong?