[JAVA2D] Adding more than one instance of extended JComponent class

[java2d]

Hello,
I trying to write application which display two dimensional Array of rectangles 
in GUI. My idea was to write class who extends JComponent class which will just 
draw rectangle on JFrame for every instance object of that class and on that 
way I want to draw a grid. Depending on reference array, every object will be 
filled with color or "empty" rectangle.
In next code fragment I trying to do this, and 'everything' working just fine 
except drawing rectangle. Problem is that his code drawing only last instance 
of created array of "GUIKolonija" objects.

import javax.swing.*;
import java.awt.*;
import java.awt.geom.*;

public class GUIIgre {
    public static void GUI(){
 
    JFrame prozor=new JFrame("Game of life");
    JButton btnNext= new JButton("Next generation");
    JButton btnStart= new JButton("Start");
    GUIKolonija[][] guiKolonija;
    guiKolonija = new GUIKolonija[10][10];
    prozor.setSize(409, 500);
    prozor.setLocationByPlatform(true);
    prozor.add(btnNext);
   
    for(int y=0; y<=10;y++)
    for(int x=0; x<=10;x++){
        guiKolonija[x][y]=new GUIKolonija();
        guiKolonija[x][y].setKoordinate(x, y);
        prozor.add(guiKolonija[x][y]);
    }
    // prozor.add(guiKolonija[0][0]);

    btnNext.setBounds(40, 430, 150, 30);
    btnStart.setBounds(220, 430,150,30);
  
  //  prozor.add(btnStart);

    prozor.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    prozor.setVisible(true);
    }
}

class GUIKolonija extends JComponent{
    private int x;
    private int y;

    public void paint(Graphics graf){
        graf.setColor(Color.BLUE);
        graf.drawRect(x*20, y*20, 20, 20);
    }
    public void setKoordinate(int x, int y){
        this.x = x;
        this.y = y;
    }
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