Windows Forms

public class ExpandableGroupBox : System.Windows.Forms.GroupBox
{
    public ExpandableGroupBox()
    {
        base.Text = "";
    }

    public override string Text
    {
        get
        {
            return label.Text;
        }
        set
        {
            label.Text = value;
        }
    }
}

public partial class ExpandableGroupBox : GroupBox
{
    public ExpandableGroupBox()
    {
        InitializeComponent();
        base.Text = "";
    }

    [EditorBrowsable(EditorBrowsableState.Always), Browsable(true),
    DesignerSerializationVisibility(DesignerSerializationVisibility.Visible),
    Bindable(true)]
    public new string Text
    {
        get
        {
            return toolStripLabel1.Text;
        }
        set
        {
            toolStripLabel1.Text = value;
        }
    }
}