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    <p>Actually you should provide a piece of code so we can understand it better. But generally i think i could understand what you mean (if i'm not wrong).</p> <p>Basically you need the layout manager on the second form. here is a code sample, i hope it can generally answer your need.</p> <p>Code for the first form</p> <pre><code>import java.awt.BorderLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JSlider; import javax.swing.event.ChangeEvent; import javax.swing.event.ChangeListener; public class FirstForm extends JFrame { JButton fbtn = new JButton("Show F2"); JSlider fslider = new JSlider(1, 10); SecondForm fsecond = new SecondForm(); public FirstForm(){ setSize(200,200); getContentPane().setLayout(new BorderLayout()); getContentPane().add(fbtn,BorderLayout.NORTH); getContentPane().add(fslider,BorderLayout.CENTER); setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); fbtn.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { fsecond.setVisible(true); } }); fslider.addChangeListener(new ChangeListener() { @Override public void stateChanged(ChangeEvent e) { fsecond.setBtnCount(fslider.getValue()); } }); } public static void main(String[] args) { // TODO code application logic here java.awt.EventQueue.invokeLater(new Runnable() { @Override public void run() { new FirstForm().setVisible(true); } }); } } </code></pre> <p>Code for the second form</p> <pre><code>import java.awt.Component; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import java.util.Vector; import javax.swing.JButton; import javax.swing.JFrame; public class SecondForm extends JFrame { Vector fbtns = new Vector(); int fshowbtncount=1; GridBagConstraints gbc = new GridBagConstraints(); public SecondForm(){ setSize(200, 200); setLocation(201, 0); getContentPane().setLayout(new GridBagLayout()); fbtns.add(new JButton("Button ".concat(String.valueOf(fbtns.size()+1)))); invalidateForm(); } private void invalidateForm(){ gbc.fill = GridBagConstraints.VERTICAL; for (int i=0; i&lt;fbtns.size(); i++) { getContentPane().remove((Component)fbtns.get(i)); } int y=0; for (int i=0; i&lt;fshowbtncount; i++) { gbc.gridx=0; gbc.gridy=y++; getContentPane().add((Component)fbtns.get(i),gbc); } pack(); invalidate(); } public void setBtnCount(int cnt){ if (cnt&gt;=0 &amp;&amp; cnt!=fshowbtncount) { fshowbtncount = cnt; while (fbtns.size()&lt;cnt) { fbtns.add(new JButton("Button ".concat(String.valueOf(fbtns.size()+1)))); } invalidateForm(); } } } </code></pre> <p>Hope this can help you out.</p>
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