gistfile1.txt

Raw java
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f.setLayout(new BoxLayout(BoxLayout.Y_AXIS));

ComponentGroup buttonGroup = new ComponentGroup();
Label buttonLabel = new Label("Buttons");
buttonLabel.setUIID("TitleLabel");
f.addComponent(buttonLabel);
final Button left = new Button("Left Alignment");
final Button right = new Button("Right Alignment");
final Button center = new Button("Center Alignment");
buttonGroup.addComponent(left);
buttonGroup.addComponent(right);
buttonGroup.addComponent(center);
f.addComponent(buttonGroup);

YAML
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Container:
	layout: 
		BoxLayout:
			axis: y
	children:
		ComponentGroup:
			id: buttonGroup
			Label:
				text: "Buttons"
				uiid: "TitleLabel"
				
			Button:
				text: "Left Alignment"
				id: left
			Button:
				text: "Right alignment"
				id: right
			Button:
				text: "Center alignment"
				id: center