Hello,

 I wrote a small sample application to show what I want, so first of all here is the code: 

public Form1()

    {
      InitializeComponent();

      // MainLayout
      //
      UltraGridBagLayoutPanel mainLayout = new UltraGridBagLayoutPanel();
      mainLayout.BackColor = System.Drawing.Color.Coral;
      mainLayout.ExpandToFitHeight = true;
      mainLayout.ExpandToFitWidth = true;
      mainLayout.AutoSize = true;
      mainLayout.AutoSizeMode = AutoSizeMode.GrowAndShrink;

      this.Controls.Add(mainLayout);

      // SubLayout
      //
      UltraGridBagLayoutPanel subLayout = new UltraGridBagLayoutPanel();
      subLayout.BackColor = System.Drawing.Color.Cyan;
      subLayout.ExpandToFitHeight = true;
      subLayout.ExpandToFitWidth = true;
      subLayout.AutoSize = true;
      subLayout.AutoSizeMode = AutoSizeMode.GrowAndShrink;

      // add SubLayout
      mainLayout.Controls.Add(subLayout);

      GridBagConstraint constraint = mainLayout.GetGridBagConstraint(subLayout);
      constraint.OriginX = 0;
      constraint.OriginY = 0;
      constraint.SpanX = 1;
      constraint.SpanY = 1;
      constraint.WeightX = 1;
      constraint.WeightY = 1;
      constraint.Insets.Left = 5;
      constraint.Insets.Right = 5;
      constraint.Insets.Top = 5;
      constraint.Insets.Bottom = 5;

      // add Label to SubLayout
      Label tempLabel = new Label();
      tempLabel.Text = "Christmas";

      subLayout.Controls.Add(tempLabel);

      constraint = subLayout.GetGridBagConstraint(tempLabel);
      constraint.OriginX = 0;
      constraint.OriginY = 0;
      constraint.SpanX = 1;
      constraint.SpanY = 1;
      constraint.WeightX = 1;
      constraint.WeightY = 1;
      constraint.Insets.Left = 5;
      constraint.Insets.Right = 5;
      constraint.Insets.Top = 5;
      constraint.Insets.Bottom = 5;

      // add Label to SubLayout
      UltraDateTimeEditor dateEdit = new UltraDateTimeEditor();
      dateEdit.DateTime = new System.DateTime(2008, 12, 24);

      subLayout.Controls.Add(dateEdit);

      constraint = subLayout.GetGridBagConstraint(dateEdit);
      constraint.OriginX = 1;
      constraint.OriginY = 0;
      constraint.SpanX = 1;
      constraint.SpanY = 1;
      constraint.WeightX = 1;
      constraint.WeightY = 1;
      constraint.Insets.Left = 5;
      constraint.Insets.Right = 5;
      constraint.Insets.Top = 5;
      constraint.Insets.Bottom = 5;

      // add some Controls to mainLayout
      RadioButton btn = new RadioButton();
      btn.Text = "1";

      mainLayout.Controls.Add(btn);

      constraint = mainLayout.GetGridBagConstraint(btn);
      constraint.OriginX = 0;
      constraint.OriginY = 1;
      constraint.SpanX = 1;
      constraint.SpanY = 1;
      constraint.WeightX = 1;
      constraint.WeightY = 1;
      constraint.Insets.Left = 5;
      constraint.Insets.Right = 5;
      constraint.Insets.Top = 5;
      constraint.Insets.Bottom = 5;

      // add some Controls to mainLayout
      btn = new RadioButton();
      btn.Text = "2";

      mainLayout.Controls.Add(btn);

      constraint = mainLayout.GetGridBagConstraint(btn);
      constraint.OriginX = 0;
      constraint.OriginY = 2;
      constraint.SpanX = 1;
      constraint.SpanY = 1;
      constraint.WeightX = 1;
      constraint.WeightY = 1;
      constraint.Insets.Left = 5;
      constraint.Insets.Right = 5;
      constraint.Insets.Top = 5;
      constraint.Insets.Bottom = 5;

      // add some Controls to mainLayout
      btn = new RadioButton();
      btn.Text = "3";

      mainLayout.Controls.Add(btn);

      constraint = mainLayout.GetGridBagConstraint(btn);
      constraint.OriginX = 0;
      constraint.OriginY = 3;
      constraint.SpanX = 1;
      constraint.SpanY = 1;
      constraint.WeightX = 1;
      constraint.WeightY = 1;
      constraint.Insets.Left = 5;
      constraint.Insets.Right = 5;
      constraint.Insets.Top = 5;
      constraint.Insets.Bottom = 5;

      // add some Controls to mainLayout
      btn = new RadioButton();
      btn.Text = "4";

      mainLayout.Controls.Add(btn);

      constraint = mainLayout.GetGridBagConstraint(btn);
      constraint.OriginX = 0;
      constraint.OriginY = 4;
      constraint.SpanX = 1;
      constraint.SpanY = 1;
      constraint.WeightX = 1;
      constraint.WeightY = 1;
      constraint.Insets.Left = 5;
      constraint.Insets.Right = 5;
      constraint.Insets.Top = 5;
      constraint.Insets.Bottom = 5;

    }

What I want is that:

1.) The Layout has arrange its size, that all controls are COMPLETELY visibel (see DateTimeEditor)

2.) Why is there a gap between the SubLayout and the first RadioButton

3.) How do I get the Form streched, to see all Controls

4.) If I do a mainLayout.Dock = DockStyle.Fill then the RadioButtons are not completely visible

 What am I doing wrong ?

Regards,

Patrick