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   public class ExtendedWorkLoadToolPart : ToolPart

protected override void CreateChildControls()

{

    base.CreateChildControls();

    /// Añadir nuestros controles  

}

/// <summary>

/// Sends the tool part content to the specified HtmlTextWriter object, 

/// which writes the content to be rendered on the client.

/// </summary>

/// <param name="output">The HtmlTextWriter object that receives the tool part content.</param>

protected override void RenderToolPart(System.Web.UI.HtmlTextWriter output)

{

    // Establish a reference to the Web Part.

    WorkLoadWebPart workLoadWebPart =

        (WorkLoadWebPart)this.ParentToolPane.SelectedWebPart;

    output.Write("<table width=\"100%\" cellspacing=\"0\" cellpadding=\"2\"><tr><td colspan=\"2\">");

    _lblDataHeader.Text = SPUtility.GetLocalizedString("$Resources:webpart_lblDataHeader_text", "company", SPContext.Current.Web.Language);

    _lblDataHeader.Font.Bold = true;

    _lblDataHeader.RenderControl(output);

    output.Write("<hr></td></tr><tr><td>");

    _lblObjectType.Text = SPUtility.GetLocalizedString("$Resources:webpart_lblObjectType_text", "company", SPContext.Current.Web.Language);

    _lblObjectType.RenderControl(output);

    output.Write("</td><td>");

    _ddlObjectType.SelectedValue = Enum.GetName(typeof(EnumObjectType), workLoadWebPart.TipoObjeto);

    _ddlObjectType.RenderControl(output);

    output.Write("</td></tr><tr><td>");

    _lblActiveUser.Text = SPUtility.GetLocalizedString("$Resources:webpart_lblActiveUser_text", "company", SPContext.Current.Web.Language);

    _lblActiveUser.RenderControl(output);

    output.Write("</td><td>");

    _chkActiveUser.Checked = workLoadWebPart.UsuarioActivo;

    _chkActiveUser.RenderControl(output);

    output.Write("</td></tr><tr><td>");

    _lblDelimerChar.Text = SPUtility.GetLocalizedString("$Resources:webpart_lblDelimerChar_text", "company", SPContext.Current.Web.Language);

    _lblDelimerChar.RenderControl(output);

    output.Write("</td><td>");

    _txtDelimiterChar.Text = workLoadWebPart.DelimitadorUsurios.ToString();

    _txtDelimiterChar.RenderControl(output);

    output.Write("</td></tr><tr><td colspan=\"2\">");

    _lblVariosHeader.Text = SPUtility.GetLocalizedString("$Resources:webpart_lblVariosHeader_text", "company", SPContext.Current.Web.Language);

    _lblVariosHeader.Font.Bold = true;

    _lblVariosHeader.RenderControl(output);

    output.Write("<hr></td></tr><tr><td>");

    _lblBarType.Text = SPUtility.GetLocalizedString("$Resources:webpart_lblBarType_text", "company", SPContext.Current.Web.Language);

    _lblBarType.RenderControl(output);

    output.Write("</td><td>");

    _ddlBarType.SelectedValue = Enum.GetName(typeof(EnumBarType), workLoadWebPart.TipoBarra);

    _ddlBarType.RenderControl(output);

    output.Write("</td></tr><tr><td>");

    _lblShowLabels.Text = SPUtility.GetLocalizedString("$Resources:webpart_lblShowLabels_text", "company", SPContext.Current.Web.Language);

    _lblShowLabels.RenderControl(output);

    output.Write("</td><td>");

    _chkShowLabels.Checked = workLoadWebPart.MostrarEtiquetas;

    _chkShowLabels.RenderControl(output);

    output.Write("</td></tr><tr><td>");

    _lblPlacePecentage.Text = SPUtility.GetLocalizedString("$Resources:webpart_lblPlacePecentage_text", "company", SPContext.Current.Web.Language);

    _lblPlacePecentage.RenderControl(output);

    output.Write("</td><td>");

    _ddlPlacePercentage.SelectedValue = Enum.GetName(typeof(EnumPlacePercentage), workLoadWebPart.UbicacionPorcentaje);

    _ddlPlacePercentage.RenderControl(output);

    output.Write("</td></tr><tr><td>");

    output.Write("</td></tr><tr><td colspan=\"2\">");

    _lblSecurityHeader.Text = SPUtility.GetLocalizedString("$Resources:webpart_lblSecurityHeader_text", "company", SPContext.Current.Web.Language);

    _lblSecurityHeader.Font.Bold = true;

    _lblSecurityHeader.RenderControl(output);

    output.Write("<hr></td></tr><tr><td>");

    _lblProfiles.Text = SPUtility.GetLocalizedString("$Resources:webpart_lblProfiles_text", "company", SPContext.Current.Web.Language);

    _lblProfiles.RenderControl(output);

    output.Write("</td><td>");

    _ddlProfiles.SelectedValue = workLoadWebPart.PerfilPermitido;

    _ddlProfiles.RenderControl(output);

    output.Write("</td></tr></table>");

}

// Establish a reference to the Web Part.

WorkLoadWebPart customWebPartEx1 =

        (WorkLoadWebPart)this.ParentToolPane.SelectedWebPart;

/// <summary>

/// Called when the user clicks the OK or the Apply button in the tool pane.

/// </summary>

public override void ApplyChanges()

{

    // Establish a reference to the Web Part.

    WorkLoadWebPart workLoadWebPart =

        (WorkLoadWebPart)this.ParentToolPane.SelectedWebPart;

    workLoadWebPart.UbicacionPorcentaje = (EnumPlacePercentage)Enum.Parse(typeof(EnumPlacePercentage), _ddlPlacePercentage.SelectedValue);

    workLoadWebPart.TipoBarra = (EnumBarType)Enum.Parse(typeof(EnumBarType), _ddlBarType.SelectedValue);

    workLoadWebPart.PerfilPermitido = _ddlProfiles.SelectedValue;

    workLoadWebPart.TipoObjeto = (EnumObjectType)Enum.Parse(typeof(EnumObjectType), _ddlObjectType.SelectedValue);

    workLoadWebPart.MostrarEtiquetas = _chkShowLabels.Checked;

    workLoadWebPart.UsuarioActivo = _chkActiveUser.Checked;

    workLoadWebPart.DelimitadorUsurios = _txtDelimiterChar.Text.ToCharArray()[0];

}

/// <summary>

/// Determines which tool parts are displayed in the tool pane of the Web-based Web Part design user interface, and the order in which they are displayed.

/// </summary>

/// <returns>

/// An array of type <see cref="T:Microsoft.SharePoint.WebPartPages.ToolPart"></see> that determines which tool parts will be displayed in the tool pane. If a Web Part that implements one or more custom properties does not override the <see cref="M:Microsoft.SharePoint.WebPartPages.WebPart.GetToolParts"></see> method, the base class method will return an instance of the <see cref="T:Microsoft.SharePoint.WebPartPages.WebPartToolPart"></see> class and an instance of the <see cref="T:Microsoft.SharePoint.WebPartPages.CustomPropertyToolPart"></see> class. An instance of the <see cref="T:Microsoft.SharePoint.WebPartPages.WebPartToolPart"></see> class displays a tool part for working with the properties provided by the WebPart base class. An instance of the <see cref="T:Microsoft.SharePoint.WebPartPages.CustomPropertyToolPart"></see> class displays a built-in tool part for working custom Web Part properties, as long as the custom property is of one of the types supported by that tool part. The supported types are: String, Boolean, Integer, DateTime, or Enum.

/// </returns>

[SharePointPermission(SecurityAction.Demand, ObjectModel = true)]

public override ToolPart[] GetToolParts()

{

    return new ToolPart[] { new WebPartToolPart(), new ExtendedWorkLoadToolPart() };

}