How Derived private field a class to another class

public class MyClass:Button
{
 	MyClass()
	{
	this.Location = new System.Drawing.Point(134, 34);
	}
}
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///a property of Button Class(.NET Source Code )
public Point Location
{
    get
    {
        return new Point(this.x, this.y);        //x is a private field
    }
    set
    {
        this.SetBounds(value.X, value.Y, this.width, this.height, BoundsSpecified.Location);
    }
}