//prepare window macro
WindowMacro oWindowMacro = new WindowMacro();
oWindowMacro.Open("$(MD_MACROS)\\ENT.11043516.ema", m_oTestProject);

//prepare DrawingService
DrawingService oDrawingService = new DrawingService();
oDrawingService.MacroPreview = true;
oDrawingService.CreateDisplayList(oWindowMacro);

//prepare preview form
Form oForm = new Form();
Panel oPanel = new Panel();
oPanel.Dock = DockStyle.Fill;
oPanel.Size = new System.Drawing.Size((int)oWindowMacro.Size.X, (int)oWindowMacro.Size.Y);
oForm.Controls.Add(oPanel);
oPanel.Paint += delegate(object sender, PaintEventArgs e) { oDrawingService.DrawDisplayList(e, oForm.ClientRectangle); };

//show preview
oForm.Show();

public void DisplayPlacements()
{
    try
    {
        Project oPrj = new ProjectManager().OpenProject("$(MD_PROJECTS)\\ESS_Sample_Project.elk");
        if (oPrj == null || !oPrj.IsOpen)
        {
            return;
        }

        Page[] arrPages = oPrj.Pages;
        Placement[] arrPlacements = null;
        foreach (Page oPage in arrPages)
        {
            if (oPage.AllPlacements.Length > 0)
            {
                arrPlacements = oPage.AllPlacements;
                break;
            }
        }

        if (arrPlacements != null)
        {
            PreviewForm frm = new PreviewForm();
            frm.Placements = arrPlacements;
            frm.ShowDialog();
        }
    }
    catch (Eplan.EplApi.Base.BaseException e)
    {
        Console.Out.WriteLine(e.Message);
    }
}
/////////////////////
// PreviewForm.cs  //
/////////////////////   


internal class PreviewForm : System.Windows.Forms.Form
{
    private System.ComponentModel.Container components = null;
    private System.Windows.Forms.Panel pnlPreview;
    private System.Windows.Forms.Panel pnlCtrls;
    private Eplan.EplApi.DataModel.Placement[] _arrPalcements = null; //array of Placements to preview
    private System.Windows.Forms.ToolBarButton btnZoomAll;
    private System.Windows.Forms.ToolBarButton btnZoomIn;
    private System.Windows.Forms.ToolBarButton btnZoomOut;
    private System.Windows.Forms.ToolBarButton separator;
    private System.Windows.Forms.ToolBar toolBarPreview;
    private System.Windows.Forms.ToolBarButton btnDrawConenctions;
    private System.Windows.Forms.ToolBarButton btnBlackWhite;
    private Eplan.EplApi.HEServices.DrawingService dwgService = new Eplan.EplApi.HEServices.DrawingService();

    public Eplan.EplApi.DataModel.Placement[] Placements
    {
        get
        {
            return _arrPalcements;
        }
        set
        {
            _arrPalcements = value;
            if (value != null)
                dwgService.CreateDisplayList(value);
        }
    }

    public PreviewForm()
    {
        InitializeComponent();

        this.btnZoomAll.Text = "Zoom all";
        this.btnZoomIn.Text = "Zoom in";
        this.btnZoomOut.Text = "Zoom out";
        this.separator.Text = "Separator";
        this.btnDrawConenctions.Text = "Draw connections";
        this.btnBlackWhite.Text = "Black white";
    }

    /// Clean up any resources being used.
    protected override void Dispose(bool disposing)
    {
        if (disposing)
        {
            if (components != null)
            {
                components.Dispose();
            }
        }
        base.Dispose(disposing);
    }

    /// Required method for Designer support - do not modify
    /// the contents of this method with the code editor.
    private void InitializeComponent()
    {
        this.pnlPreview = new System.Windows.Forms.Panel();
        this.pnlCtrls = new System.Windows.Forms.Panel();
        this.toolBarPreview = new System.Windows.Forms.ToolBar();
        this.btnZoomAll = new System.Windows.Forms.ToolBarButton();
        this.btnZoomIn = new System.Windows.Forms.ToolBarButton();
        this.btnZoomOut = new System.Windows.Forms.ToolBarButton();
        this.separator = new System.Windows.Forms.ToolBarButton();
        this.btnDrawConenctions = new System.Windows.Forms.ToolBarButton();
        this.btnBlackWhite = new System.Windows.Forms.ToolBarButton();
        this.pnlCtrls.SuspendLayout();
        this.SuspendLayout();
        this.Resize += new System.EventHandler(this.ResizeEndHandler);
        // 
        // pnlPreview
        // 
        this.pnlPreview.BackColor = System.Drawing.Color.WhiteSmoke;
        this.pnlPreview.Dock = System.Windows.Forms.DockStyle.Fill;
        this.pnlPreview.Location = new System.Drawing.Point(0, 0);
        this.pnlPreview.Name = "pnlPreview";
        this.pnlPreview.Size = new System.Drawing.Size(292, 266);
        this.pnlPreview.TabIndex = 0;
        this.pnlPreview.Paint += new System.Windows.Forms.PaintEventHandler(this.pnlPreview_Paint);
        // 
        // pnlCtrls
        // 
        this.pnlCtrls.Controls.Add(this.toolBarPreview);
        this.pnlCtrls.Dock = System.Windows.Forms.DockStyle.Top;
        this.pnlCtrls.Location = new System.Drawing.Point(0, 0);
        this.pnlCtrls.Name = "pnlCtrls";
        this.pnlCtrls.Size = new System.Drawing.Size(292, 40);
        this.pnlCtrls.TabIndex = 1;
        // 
        // toolBarPreview
        // 
        this.toolBarPreview.Buttons.AddRange(new System.Windows.Forms.ToolBarButton[] {
            this.btnZoomAll,
                this.btnZoomIn,
                this.btnZoomOut,
                this.separator,
                this.btnDrawConenctions,
                this.btnBlackWhite});
        this.toolBarPreview.DropDownArrows = true;
        this.toolBarPreview.Location = new System.Drawing.Point(0, 0);
        this.toolBarPreview.Name = "toolBarPreview";
        this.toolBarPreview.ShowToolTips = true;
        this.toolBarPreview.Size = new System.Drawing.Size(292, 28);
        this.toolBarPreview.TabIndex = 0;
        this.toolBarPreview.ButtonClick += new System.Windows.Forms.ToolBarButtonClickEventHandler(this.toolBarPreview_ButtonClick);
        // 
        // separator
        // 
        this.separator.Style = System.Windows.Forms.ToolBarButtonStyle.Separator;
        // 
        // btnDrawConenctions
        // 
        this.btnDrawConenctions.Style = System.Windows.Forms.ToolBarButtonStyle.ToggleButton;
        // 
        // btnBlackWhite
        // 
        this.btnBlackWhite.Style = System.Windows.Forms.ToolBarButtonStyle.ToggleButton;
        // 
        // PreviewForm
        // 
        this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
        this.ClientSize = new System.Drawing.Size(292, 266);
        this.Controls.Add(this.pnlCtrls);
        this.Controls.Add(this.pnlPreview);
        this.Name = "PreviewForm";
        this.Text = "Preview";
        this.pnlCtrls.ResumeLayout(false);
        this.ResumeLayout(false);
    }

    private void ResizeEndHandler(object sender, EventArgs e)
    {
        this.Invalidate();
        this.Refresh();
    }

    private void pnlPreview_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
    {
        if (_arrPalcements != null)
        {
            dwgService.DrawDisplayList(e, this.ClientRectangle);
        }
    }

    private void toolBarPreview_ButtonClick(object sender, System.Windows.Forms.ToolBarButtonClickEventArgs e)
    {
        if (e.Button == this.btnZoomAll)
        {
            dwgService.ZoomAll();
        }
        else if (e.Button == this.btnZoomIn)
        {
            dwgService.ZoomIn(2.0);
        }
        else if (e.Button == this.btnZoomOut)
        {
            dwgService.ZoomOut(2.0);
        }
        else if (e.Button == this.btnDrawConenctions)
        {
            dwgService.DrawConnections = this.btnDrawConenctions.Pushed;
            if (_arrPalcements != null)
                dwgService.CreateDisplayList(_arrPalcements);
        }
        else if (e.Button == this.btnBlackWhite)
        {
            dwgService.DrawBlackAndWhite = this.btnBlackWhite.Pushed;
            if (_arrPalcements != null)
                dwgService.CreateDisplayList(_arrPalcements);
        }
        pnlPreview.Refresh();
    }
}