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using Sys = System;
using SysIO = System.IO;
using SysWinMarkup = System.Windows.Markup;
using SysXml = System.Xml;
using SysXmlLinq = System.Xml.Linq;

public static class XamlUtils {
	public static object GetXamlObject(string source) {
		SysXml.XmlDocument _xmlDocument = new SysXml.XmlDocument();
		_xmlDocument.LoadXml(source);

		return Xaml.GetXamlObject(_xmlDocument);
	}

	public static object GetXamlObject(SysXml.XmlDocument xmlDocument) {
		const string xmlns = "http://schemas.microsoft.com/winfx/2006/xaml/presentation";
		const string xmlns_x = "http://schemas.microsoft.com/winfx/2006/xaml";

		if(string.IsNullOrEmpty(xmlDocument.DocumentElement.GetAttribute("xmlns"))) {
			xmlDocument.DocumentElement.SetAttribute("xmlns", xmlns);
		}
		if(string.IsNullOrEmpty(xmlDocument.DocumentElement.GetAttribute("xmlns:x"))) {
			xmlDocument.DocumentElement.SetAttribute("xmlns:x", xmlns_x);
		}

		SysIO.TextReader _stringReader = new SysIO.StringReader(xmlDocument.OuterXml);
		SysXml.XmlReader _xmlReader = new SysXml.XmlTextReader(_stringReader);
			
		return SysWinMarkup.XamlReader.Load(_xmlReader);
	}
}

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System.Windows.Controls.Grid _gridObject = XamlUtils.GetXamlObject("<Grid><TextBlock>ok</TextBlock></Grid>") as System.Windows.Controls.Grid;
this.Content = _gridObject;