l.setText("Color:");
gd = new GridData();
gd.horizontalAlignment = GridData.BEGINNING;
l.setLayoutData(gd);
fAppearanceColorEditor = new ColorEditor(stylesComposite);
Button foregroundColorButton = fAppearanceColorEditor.getButton();
gd = new GridData(GridData.FILL_HORIZONTAL);
gd.horizontalAlignment = GridData.BEGINNING;
foregroundColorButton.setLayoutData(gd);