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Laying Out Children of a Composite

public  void layout( boolean changed) Setting the changed flag to true forces the layout to refresh any cached information about its children. On Windows, the information about the children is always updated regardless of the value of the changed flag. import org.eclipse.swt.SWT; import org.eclipse.swt.events.SelectionAdapter; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.layout.RowLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; public class CompositeLayout {   static int count = 0;   public static void main(String[] args) {     Display display = new Display();     final Shell shell = new Shell(display);     shell.setLayout(new RowLayout());     Button buttonAdd = new Button(shell, SWT.PUSH);     buttonAdd.setText("Add new button");     buttonAdd.addSelectionListener(new SelectionAdapter() {       public void widgetSelected(SelectionEvent e) {         Button button = new Button(shell, SWT.PUSH);         button.setText("Button #" + (count++));         shell.layout(true);         shell.pack();         // shell.layout(true;         // shell.pack(true);       }     });     shell.setSize(450, 100);     shell.open();     while (!shell.isDisposed()) {       if (!display.readAndDispatch()) {         display.sleep();       }     }     display.dispose();   } }