Hosting WPF Content in a Java Application

package com.oojni;
import java.awt.Canvas;

/**
 * Wraps the main functionality of Calendar Component.
 * 
 * @author Vitaly Shelest
 *
 */
public class CalendarContainer extends Canvas {
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	static{
		System.loadLibrary("oojni.net20"); 
		System.loadLibrary("JavaHostWPF");
	}
	/**
	 * Stores a reference to .NET Container
	 */
	int ref = 0;
	protected void finalize() throws Throwable {
		super.finalize();
	}
	/**
	 * The place to create .NET Container
	 */
	public void addNotify() {
		super.addNotify();
		ref = create(this);
	}
	/**
	 * Used to dispose .NET Container
	 */
	public void removeNotify() {
		dispose(ref);
		super.removeNotify();
	}
	/**
	 * Disposes .NET Container
	 *
	 */
	public void dispose()
	{
		if(ref != 0)
			dispose(ref);
		ref = 0;
	}
	/**
	 * Returns Year
	 * 
	 * @return year value
	 */
	int getYearFromControl()
	{
		return getYearFromControl(ref);
	}
	/**
	 * Returns Month
	 * 
	 * @return month value
	 */
	int getMonthFromControl()
	{
		return getMonthFromControl(ref);
	}
	/**
	 * Returns Day
	 * 
	 * @return day of the month value
	 */
	int getDayFromControl()
	{
		return getDayFromControl(ref);
	}
	/**
	 * Sets WPF Clock Component Date/Time
	 * 
	 * @param _year year value
	 * @param _month month value
	 * @param _day day of the month value
	 * @param _hours hour value
	 * @param _minutes minutes value
	 * @param _seconds secons value
	 */
	void setSystemTime(int _year, int _month, int _day, int _hours, int _minutes, int _seconds)
	{
		setSystemTime(ref, _year, _month, _day, _hours, _minutes, _seconds);
	}
	/**
	 * Returns Year
	 * 
	 * @param ref .NET Container reference
	 * @return year value
	 */
	native int getYearFromControl(int ref);
	/**
	 * Returns Month
	 * 
	 * @param ref .NET Container reference
	 * @return month value
	 */
	native int getMonthFromControl(int ref);
	/**
	 * Returns Month
	 * 
	 * @param ref .NET Container reference
	 * @return day of month value
	 */
	native int getDayFromControl(int ref);
	/**
	 * Sets WPF Component Date/Time
	 * 
	 * @param ref .NET Container reference
	 * @param _year year value
	 * @param _month month value
	 * @param _day day of month value
	 * @param _hours hour value
	 * @param _minutes minutes value
	 * @param _seconds seconds value
	 */
	native void setSystemTime(int ref, int _year, int _month, int _day, int _hours, int _minutes, int _seconds);
	/**
	 * Creates .NET Container
	 * @param parent Java component as a placeholder for .NET Container
	 * @return reference to .NET Container
	 */
	native int create(Object parent);
	/**
	 * Disposes .NET Container
	 * @param ref reference to .NET Container
	 */
	native void dispose(int ref);
}