Question

I can specify the Margin for each stack panel element, but that will be duplication… and in case of change I will need to update all controls…

Is there any way to define that once for the stack panel?

Thank you

Answer 1

(sorry for my bad english)

Xin answers is perfect for what you asked but if you want to set more properties for all the stackPanels I suggest you to create a style:

 <Style TargetType="StackPanel" x:Key="CustomStackPanel">
     <Setter Property="Margin" Value="10,12,15,20"/>
     <Setter Property="Height" Value="50"/>                
 </Style>

and use it like this:

<StackPanel>
    <StackPanel Background="Red" Style="{StaticResource CustomStackPanel}"/>
    <StackPanel Background="Green" Style="{StaticResource CustomStackPanel}"/>
    <StackPanel Background="Blue" Style="{StaticResource CustomStackPanel}"/>
</StackPanel>

If you remove the x:Key from the style, all StackPanels inside the element that contains the style will use that style. If you declare that style on your app.xaml, all stackPanels on your app will use it.