this.setLayout(new GridBagLayout());
_preview.setOpaque(true);
this.add(red,new GridBagConstraints(0, 0, 1, 1, 0.0, 1.0, GridBagConstraints.CENTER, GridBagConstraints.BOTH, new Insets(5,5,5,5),0,0));
this.add(redslider,new GridBagConstraints(1, 0, 1, 1, 1.0, 1.0, GridBagConstraints.CENTER, GridBagConstraints.BOTH, new Insets(5,5,5,5),0,0));
this.add(green,new GridBagConstraints(0, 1, 1, 1, 0.0, 1.0, GridBagConstraints.CENTER, GridBagConstraints.BOTH, new Insets(5,5,5,5),0,0));
this.add(greenslider,new GridBagConstraints(1, 1, 1, 1, 1.0, 1.0, GridBagConstraints.CENTER, GridBagConstraints.BOTH, new Insets(5,5,5,5),0,0));
this.add(blue,new GridBagConstraints(0, 2, 1, 1, 0.0, 1.0, GridBagConstraints.CENTER, GridBagConstraints.BOTH, new Insets(5,5,5,5),0,0));
this.add(blueslider,new GridBagConstraints(1, 2, 1, 1, 1.0, 1.0, GridBagConstraints.CENTER, GridBagConstraints.BOTH, new Insets(5,5,5,5),0,0));
this.add(opaq,new GridBagConstraints(0, 3, 1, 1, 0.0, 1.0, GridBagConstraints.CENTER, GridBagConstraints.BOTH, new Insets(5,5,5,5),0,0));
this.add(opaqslider,new GridBagConstraints(1, 3, 1, 1, 1.0, 1.0,GridBagConstraints.CENTER, GridBagConstraints.BOTH, new Insets(5,5,5,5),0,0));
this.add(_preview,new GridBagConstraints(2, 0, 1, 4, 0.1, 1.0, GridBagConstraints.CENTER, GridBagConstraints.BOTH, new Insets(5,5,5,5),0,0));