The print preview diagram command executes this code:

if (Commander == null)
 return;

NDrawingDocument document = Commander.Document;
if (document == null)
 return;

NPrintManager manager = new NPrintManager(document);
try
{
 manager.ShowPrintPreview();
}
catch (Exception ex)
{
 MessageBox.Show("Failed to show the print preview dialog. Exception was: " + ex.Message);
}

So as you can see you need to override the command in order to preselect any settings of the newly created print manager, that is created each time you click the PrintPreview command, like this:

public class MyPrintPreviewCommand : NPrintPreviewCommand
{
    public override void Execute()
    {
        if (Commander == null)
            return;

        NDrawingDocument document = Commander.Document;
        if (document == null)
            return;

        NPrintManager manager = new NPrintManager(document);
        manager.Layout = Nevron.GraphicsCore.PagedLayout.FitToPages;
        try
        {
            manager.ShowPrintPreview();
        }
        catch (Exception ex)
        {
            MessageBox.Show("Failed to show the print preview dialog. Exception was: " + ex.Message);
        }
    }

    pubilc static void UpdateCmdBarManager(NDiagramCommandBarsManager cmdBarManager)
    {
        NDiagramCommand oldCommand = cmdBarManager.Commander.Commands.GetCommandFromId((int)DiagramCommand.PrintPreview);
        cmdBarManager.Commander.Commands.Remove(oldCommand);
        cmdBarManager.Commander.Commands.Add(new MyPrintPreviewCommand());

        cmdBarManager.Recreate();
    }
}

Last thing to do is to invoke the UpdateCmdBarManager by passing a reference to your command bars manager.

Hi,

This is a complete working sample that substitudes the print preview command.

using System;

using System.Windows.Forms;

using Nevron.Diagram;

using Nevron.Diagram.Extensions;

using Nevron.Diagram.WinForm;

using Nevron.Diagram.WinForm.Commands;

namespace WindowsFormsApplication15

{

public partial class Form1 : Form

public Form1()

{

InitializeComponent();

}

private void Form1_Load(object sender, EventArgs e)

{

NDrawingView view = new NDrawingView();

view.Dock = DockStyle.Fill;

Controls.Add(view);

view.Document = new NDrawingDocument();

NDiagramCommandBarsManager manager = new NDiagramCommandBarsManager();

manager.ParentControl = this;

manager.View = view;

MyPrintPreviewCommand.UpdateCmdBarManager(manager);

}

}

public class MyPrintPreviewCommand : NPrintPreviewCommand

public override void Execute()

{

if (Commander == null)

return;

NDrawingDocument document = Commander.Document;

if (document == null)

return;

NPrintManager manager = new NPrintManager(document);

manager.Layout = Nevron.GraphicsCore.PagedLayout.FitToPages;

try

catch (Exception ex)

{

MessageBox.Show("Failed to show the print preview dialog. Exception was: " + ex.Message);

}

}

public static void UpdateCmdBarManager(NDiagramCommandBarsManager cmdBarManager)

{

NDiagramCommand oldCommand = cmdBarManager.Commander.Commands.GetCommandFromId((int)DiagramCommand.PrintPreview);

cmdBarManager.Commander.Commands.Remove(oldCommand);

cmdBarManager.Commander.Commands.Add(new MyPrintPreviewCommand());

cmdBarManager.Recreate();

}

}

}

Parhaps there is another reason for the code not to work in your enviroment.