Code

GridPanel gp = new GridPanel();

GridRow row = new GridRow();
row.setHeight(new Length(0, LengthType.Auto)); // fit height of child components
gp.getRows().add(row);

GridColumn col0 = new GridColumn();
col0.setWidth(new Length(20));
gp.getColumns().add(col0);

GridColumn col1 = new GridColumn();
col1.setWidth(new Length(1, LengthType.Relative)); // fill remaining space
gp.getColumns().add(col1);

TextComponent text = new TextComponent();
text.setText("test");
text.setGridColumn(0);
text.setBackground(new SolidBrush(Color.white));
gp.addChild(text);

TextComponent text2 = new TextComponent();
text2.setText("test 2");
text2.setGridColumn(1);
text2.setBackground(new SolidBrush(Color.white));
gp.addChild(text2);

CompositeNode mn = new CompositeNode();
mn.getComponents().add(gp);
mn.setBounds(10, 10, 90, 90);
diagram.getNodes().add(mn);