import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.CTabFolder;
import org.eclipse.swt.custom.CTabItem;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.layout.RowLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;


public class testTabs {
    static int count;
    public static void main (String [] args) {
    	Display display = new Display ();
    	final Shell shell = new Shell(display);
    	shell.setLayout(new FillLayout());
    	shell.setText("SWT TabFolder Example");


    	CTabFolder folder = new CTabFolder(shell,SWT.NONE);
    	CTabItem item = new CTabItem(folder,SWT.UP);
    	item.setText("First");


    	CTabItem item1 = new CTabItem(folder,SWT.UP);
    	item1.setText("First new");

//---------------------------------------------------

    	CTabFolder fold = new CTabFolder(folder,SWT.UP);
    	CTabItem ite = new CTabItem(fold,SWT.UP);
    	ite.setText("Second");
    	final Composite test = new Composite(fold,SWT.NONE);
    	test.setLayout(new RowLayout());
    	Text tab1 = new Text(test,SWT.NONE);
    	tab1.setText("Testing");
    	tab1.setEditable(true);
    	ite.setControl(test);
    	item.setControl(fold);

    	Button add = new Button(test,SWT.PUSH);
    	add.setText("ADD");
    	SelectionAdapter adap = new SelectionAdapter(){
    		public void widgetSelected(SelectionEvent e){
    			Composite newcomp = new Composite(test,SWT.BORDER_DASH);
    			Text testtext = new Text(newcomp,SWT.BORDER_SOLID);
    			testtext.setText("Inside new Comp");
    			count++;
    			System.out.println(count);
    			Control array[] = shell.getChildren();
    			System.out.println(array.length);
    			shell.pack();
    		}
    	};

    	add.addSelectionListener(adap);
    	shell.open();
    	while(!shell.isDisposed()){
    		if(!display.readAndDispatch()){
    			display.sleep();
    		}
    	}

    }
}

public void widgetSelected(SelectionEvent e) {
    Composite newcomp = new Composite(test,SWT.BORDER_DASH);
    newcomp.setLayout(new RowLayout());
    ....