Why cant I add Orientation property to the Style Setter in WPF?

Your Style isn't associated with the StackPanel type Therefore, WPF doesn't know about the Orientation property. (Because that property is defined by StackPanel ) You can explicitly tell WPF which class defines the property by changing it to StackPanel. Orientation Alternatively, you can associate the Style with the StackPanel type by adding a TargetType="StackPanel to the Style element.

Your Style isn't associated with the StackPanel type. Therefore, WPF doesn't know about the Orientation property. (Because that property is defined by StackPanel) You can explicitly tell WPF which class defines the property by changing it to StackPanel.Orientation.

Alternatively, you can associate the Style with the StackPanel type by adding a TargetType="StackPanel" to the element.

Try adding a TargetType to the style, so that it knows you are talking about StackPanels. This version should work.

OOps, forgot about it! Thank you! – 0x49D1 May 27 '10 at 13:58.

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