Silverlight: Xaml Blend Namespace Error Not Resolved

XAML Namespace http://schemas.microsoft.com/expression/blend/2008 is not resolved.

This error can occur when certain Xaml elements added by blend have not been properly ignored during non design/debug situations and Blend or Visual Studio reports such error.

To resolve the error one must add the mc:Ignorable attribute to the namespace declarations to inform the Xaml compiler to ignore a specific specified namespace at appropriate times. T0 fix the above error where the blend namspace is qualified by d one needs to ingore D as shown on the highlighted line:

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

xmlns:d="http://schemas.microsoft.com/expression/blend/2008"

xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"

mc:Ignorable="d"

How Does This Happen?

I ran into this recently when Blend 4 added Xaml to allow me to populate (bind generated data) to a datagrid during design time (only in blend mind you) to work with the design data. Of course the blend namespace was there, but it never added the ignorable. It actually failed due from this line because its bringing in the blend namespace here, though I was never informed of the exact line.

<Grid x:Name="LayoutRoot"

      HorizontalAlignment="Stretch"

      d:DataContext="{d:DesignData /SampleData/HomeViewModelSampleData.xaml}">

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