Why are the tabs not generated in this code with SWT?

Hi,
Can you please tell me what is wrong in this code so that the tabs are not generated?

import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.CTabFolder;
import org.eclipse.swt.custom.CTabItem;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
import org.eclipse.swt.layout.RowLayout;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Button;

public class Gui {
    public static void main(String[] args) {
        Display display = new Display();
        Shell shell = new Shell(display);

        // Create the layout.
        RowLayout layout = new RowLayout();
        // Optionally set layout fields.
        layout.wrap = true;
        // Set the layout into the composite.
        shell.setLayout(layout);
        // Create the children of the composite.
        new Button(shell, SWT.PUSH).setText("B1");
        new Button(shell, SWT.PUSH).setText("Wide Button 2");
        new Button(shell, SWT.PUSH).setText("Button 3");
        shell.pack();
        shell.open();
        
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch()) display.sleep();
        }
        
        FillLayout fillLayout = new FillLayout();
        fillLayout.type = SWT.VERTICAL;
        shell.setLayout(fillLayout);
        new Button(shell, SWT.PUSH).setText("B1");
        new Button(shell, SWT.PUSH).setText("Wide Button 2");
        new Button(shell, SWT.PUSH).setText("Button 3");
        
        fillLayout.type = SWT.HORIZONTAL;
                
        RowLayout rowLayout = new RowLayout();
        rowLayout.wrap = false;
        rowLayout.pack = false;
        rowLayout.justify = true;
        rowLayout.type = SWT.VERTICAL;
        rowLayout.marginLeft = 5;
        rowLayout.marginTop = 5;
        rowLayout.marginRight = 5;
        rowLayout.marginBottom = 5;
        rowLayout.spacing = 0;
        shell.setLayout(rowLayout);     
        
        rowLayout.wrap = true;
        rowLayout.pack = true;
        rowLayout.justify = false;
        rowLayout.type = SWT.HORIZONTAL;
        
        shell.setLayout(new GridLayout());
        // SWT.BOTTOM to show at the bottom
        CTabFolder folder = new CTabFolder(shell, SWT.TOP);
        GridData data = new GridData(GridData.FILL, 
                GridData.FILL, true, true,
                20, 10);
        folder.setLayoutData(data);
        CTabItem cTabItem1 = new CTabItem(folder, SWT.NONE);
        cTabItem1.setText("Tab1");
        CTabItem cTabItem2 = new CTabItem(folder, SWT.NONE);
        cTabItem2.setText("Tab2");
        CTabItem cTabItem3 = new CTabItem(folder, SWT.NONE);
        cTabItem3.setText("Tab3");

        Text text = new Text(folder, SWT.BORDER);
        text.setText("You can type the list of files in this field");
        cTabItem1.setControl(text);

        shell.pack();
        shell.open();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch()) {
                display.sleep();
            }
        }
    }
}

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TolgarAsked:
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ValeriConnect With a Mentor Commented:
I can see you are the same asker. Some more advices:
1. if you remove the first occurence of this code:

while (!shell.isDisposed()) {
          if (!display.readAndDispatch()) display.sleep();
}

then you will see that your tabs are generated and shown, along with the buttons, because the buttons are created in this way: new Button(shell, SWT.PUSH).setText("B2"); which means that the respective button is direct child of the shell.

2. if you remove "rowLayout" and all of the code related to it, the result will be tha same, because "rowLayout" contains nothing.
3. Most of the constructors in swt has a parent as a first parameter. because of this it's easy to trace component hierarchy.
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zzynxSoftware engineerCommented:
>> the tabs are not generated?
Could you add a screenshot illustrating what exactly you mean?
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