Resizing a panel to fit components

I am dynamically creating and deleting comboboxes onto a panel.
My code works fine for the creating and deleting, however, I am having problems laying them out properley and can't figure out how to resize the panel to fit the components I have created.

I want the combos anchodered from the top left and filling downwards (using GridBagLayout.).

The following code shows what I have done so far.

private void addCombo(String name) {                                       
        java.awt.GridBagConstraints gridBagConstraints;
        JMappedComboBox newCombo = new anecho.gui.JMappedComboBox();
        newCombo.setSize(new Dimension(500,100));
        newCombo.setName(name);
 
        gridBagConstraints = new java.awt.GridBagConstraints();
        gridBagConstraints.gridx = 0;
        gridBagConstraints.gridy = comboPosition;
        gridBagConstraints.fill = java.awt.GridBagConstraints.VERTICAL;
        gridBagConstraints.ipady = 1;
        gridBagConstraints.anchor = java.awt.GridBagConstraints.NORTHWEST;
        
        newCombo.addItem(name,"1");
        newCombo.addItem("Two","2");
        newCombo.addItem("Three","3");
        newCombo.addItem("Four","4");
       
        jPanel2.add(newCombo, gridBagConstraints);
        //jPanel2.setl
        reloadLayout(true);
    }
 
    private void subCombo(String name) {                                       
        Component[] combos = jPanel2.getComponents();
        for (int i = 0; i < combos.length; i++)
        {
            if (name.equals(combos[i].getName())){
                jPanel2.remove(combos[i]);
                reloadLayout(false);
            }
        }
    }                                      
 
    private void reloadLayout(boolean insert){
    
        int width = 0;
        int widest = 0;
        if(insert){
            comboPosition = comboPosition + 1;
            Component[] combos = jPanel2.getComponents();
            for (int i = 0; i < combos.length; i++)
            {
                width = combos[i].getWidth();
                if(width > widest){widest = width;}
            }
            for (int i = 0; i < combos.length; i++)
            {
                combos[i].setSize(widest,combos[i].getHeight());
            }
        }
        else{
            // do nothing
        }
        
        jPanel2.revalidate();
        jPanel2.repaint();
    }

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