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[regression]
How to set the default margin to 0 and use a DataTrigger to set it to 4 0 0 0 when content is present:

1. Set the default margin to 0 on the ContentPresenter:
   response:
   <DataTrigger Binding="{Binding Content, RelativeSource={RelativeSource TemplatedParent}}" Value="{x:Null}">
   <Setter TargetName="contentPresenter" Property="Margin" Value="0"/>
   </DataTrigger>
   <DataTrigger Binding="{Binding Content, RelativeSource={RelativeSource TemplatedParent}}" Value="">
   <Setter TargetName="contentPresenter" Property="Margin" Value="0"/>
   </DataTrigger>
   <DataTrigger Binding="{Binding Content, RelativeSource={RelativeSource TemplatedParent}}">
   <DataTrigger.Value>
   <sys:String></sys:String>
   </DataTrigger.Value>
   <Setter TargetName="contentPresenter" Property="Margin" Value="0"/>
   </DataTrigger>
   <DataTrigger Binding="{Binding Content, RelativeSource={RelativeSource TemplatedParent}}" Value="{x:Null}">
   <Setter TargetName="contentPresenter" Property="Margin" Value="0"/>
   </DataTrigger>
   <DataTrigger Binding="{Binding Content, RelativeSource={RelativeSource TemplatedParent}}" Value="{x:Static sys:String.Empty}">
   <Setter TargetName="contentPresenter" Property="Margin" Value="0"/>
   </DataTrigger>
   <DataTrigger Binding="{Binding Content, RelativeSource={RelativeSource TemplatedParent}}" Value="{x:Null}">
   <Setter TargetName="contentPresenter" Property="Margin" Value="0"/>
   </DataTrigger>
   <DataTrigger Binding="{Binding Content, RelativeSource={RelativeSource TemplatedParent}}" Value="{x:Static sys:String.Empty}">
   <Setter TargetName="contentPresenter" Property="Margin" Value="0"/>
   </DataTrigger>
   <DataTrigger Binding="{Binding Content, RelativeSource={RelativeSource TemplatedParent}}" Value="{x:Null}">
   <Setter TargetName="contentPresenter" Property="Margin" Value="0"/>
   </DataTrigger>
   <DataTrigger Binding="{Binding Content, RelativeSource={RelativeSource TemplatedParent}}" Value="{x:Static sys:String.Empty}">
   <Setter TargetName="contentPresenter" Property="Margin" Value="0"/>
   </DataTrigger>
   <DataTrigger Binding="{Binding Content, RelativeSource={RelativeSource TemplatedParent}}" Value="{x:Null}">
   <Setter TargetName="contentPresenter" Property="Margin" Value="0"/>
   </DataTrigger>
   <DataTrigger Binding="{Binding Content, RelativeSource={RelativeSource TemplatedParent}}" Value="{x:Static sys:String.Empty}">
   <Setter TargetName="contentPresenter" Property="Margin" Value="0"/>
   </DataTrigger>
   <DataTrigger Binding="{Binding Content, RelativeSource={RelativeSource TemplatedParent}}" Value="{x:Null}">
   <Setter TargetName="contentPresenter" Property="Margin" Value="0"/>
   </DataTrigger>
   <DataTrigger Binding="{Binding Content, RelativeSource={RelativeSource TemplatedParent}}" Value="{x:Static sys:String.Empty}">
   <Setter TargetName="contentPresenter" Property="Margin" Value="0"/>
   </DataTrigger>
   <DataTrigger Binding="{Binding Content, RelativeSource={RelativeSource TemplatedParent}}" Value="{x:Null}">
   <Setter TargetName="contentPresenter" Property="Margin" Value="0"/>
   </DataTrigger>
   <DataTrigger Binding="{Binding Content, RelativeSource={RelativeSource TemplatedParent}}" Value="{x:Static sys:String.Empty}">
   <Setter TargetName="contentPresenter" Property="Margin" Value="0"/>
   </DataTrigger>
   <DataTrigger Binding="{Binding Content, RelativeSource={RelativeSource TemplatedParent}}" Value="{x:Null}">
   <Setter TargetName="contentPresenter" Property="Margin" Value="0"/>
   </DataTrigger>
   <DataTrigger Binding="{Binding Content, RelativeSource={RelativeSource TemplatedParent}}" Value="{x:Static sys:String.Empty}">
   <Setter TargetName="contentPresenter" Property="Margin" Value="0"/>
   </DataTrigger>
   <DataTrigger Binding="{Binding Content, RelativeSource={RelativeSource TemplatedParent}}" Value="{x:Null}">
   <Setter TargetName="contentPresenter" Property="Margin" Value="0"/>
   </DataTrigger>
   <DataTrigger Binding="{Binding Content, RelativeSource={RelativeSource TemplatedParent}}" Value="{x:Static sys:String.Empty}">
   <Setter TargetName="contentPresenter" Property="Margin" Value="0"/>
   </DataTrigger>
   <DataTrigger Binding="{Binding Content, RelativeSource={RelativeSource TemplatedParent}}" Value="{x:Null}">
   <Setter TargetName="contentPresenter" Property="Margin" Value="0"/>
   </DataTrigger>
   <DataTrigger Binding="{Binding Content, RelativeSource={RelativeSource TemplatedParent}}" Value="{x:Static sys:String.Empty}">
   <Setter TargetName="contentPresenter" Property="Margin" Value="0"/>
   </DataTrigger>
   <DataTrigger Binding="{Binding Content, RelativeSource={RelativeSource TemplatedParent}}" Value="{x:Null}">
   <Setter TargetName="contentPresenter" Property="Margin" Value="0"/>
   </DataTrigger>
   <DataTrigger Binding="{Binding Content, RelativeSource={RelativeSource TemplatedParent}}" Value="{x:Static

Original Comments

Feedback Bot on 7/30/2025, 07:48 AM:

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