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Setting design time DataContext on a Window is giving a compiler error?

I have the following XAML below for the main window in my WPF application, I am trying to set the design time d:DataContext below, which I can successfully do for all my various UserControls, but it gives me this error when I try to do it on the window... ...
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Rails - Nested includes on Active Records?

I have a list of events that I fetch. I'm trying to include every user associated to this event and every profile associated to each user. The Users get included but not their profiles. ...
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Store query result in a variable using in PL/pgSQL

How to assign the result of a query to a variable in PL/pgSQL, the procedural language of PostgreSQL? 5 Answers ...
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How to undo 'git reset'?

What's the simplest way to undo the 4 Answers 4 ...
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Filtering a list based on a list of booleans

I have a list of values which I need to filter given the values in a list of booleans: 6 Answers ...
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Gradle, “sourceCompatibility” vs “targetCompatibility”?

What is the relationship/difference between sourceCompatibility and targetCompatibility ? What happens when they are set to different values? ...
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form_for but to post to a different action

I want to have a form_for @user , but post to a custom action in the users controller. 6 Answers ...
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How to change color of SVG image using CSS (jQuery SVG image replacement)?

This is a self Q&A of a handy piece of code I came up with. 17 Answers 17 ...
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Properties order in Margin

If I have such string in XAML: 4 Answers 4 ...
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What is the difference between SIGSTOP and SIGTSTP?

Just wondering about the difference between SIGSTOP and SIGTSTP signals. 3 Answers 3...