Code

<Window x:Class="mindfusionTest.Views.ShellView"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:mindfusionTest.Views"
        xmlns:diag="http://mindfusion.eu/diagramming/wpf"
        mc:Ignorable="d"
        Title="ShellView" Height="450" Width="800">
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="20"/>
            <ColumnDefinition Width="auto"/>
            <ColumnDefinition Width="auto"/>
            <ColumnDefinition Width="*"/>
            <ColumnDefinition Width="20"/>
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition Height="20"/>
            <RowDefinition Height="auto"/>
            <RowDefinition Height="auto"/>
            <RowDefinition Height="*"/>
            <RowDefinition Height="20"/>
        </Grid.RowDefinitions>

        <Button x:Name="InsertNode" Grid.Row="1" Grid.Column="1" Width="50" Height="20">Insert</Button>

        <diag:Diagram x:Name="flowchart" Behavior="DrawLinks" Grid.Row="1" Grid.Column="2" Grid.ColumnSpan="2" Grid.RowSpan="3" ></diag:Diagram>

        <TextBlock x:Name="TextIt" Grid.Column="2" Grid.Row="0" Grid.ColumnSpan="2"></TextBlock>
    </Grid>
</Window>
 

Code

using Caliburn.Micro;
using MindFusion.Diagramming.Wpf;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace mindfusionTest.ViewModels
{
    class ShellViewModel : Screen
    {
        private string _textIt;

        public string TextIt
        {
            get { return _textIt; }
            set
            { _textIt = value;
                NotifyOfPropertyChange(() => TextIt);
            }
        }

        public void InsertNode()
        {
            flowchart.Items.Add(new ShapeNode { Shape = Shapes.RoundRect, Bounds = new System.Windows.Rect(0, 0, 40, 40) });
            TextIt = "Button Works!";
        }
    }
}
 

Code

<Application x:Class="mindfusionTest.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:local="clr-namespace:mindfusionTest">

    <Application.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <ResourceDictionary>
                    <local:Bootstrapper x:Key="Bootstrapper"/>
                </ResourceDictionary>
            </ResourceDictionary.MergedDictionaries>
        </ResourceDictionary>
    </Application.Resources>
</Application> 

Code

using Caliburn.Micro;
using mindfusionTest.ViewModels;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;

namespace mindfusionTest
{
    class Bootstrapper : BootstrapperBase
    {
        public Bootstrapper()
        {
            Initialize();
        }

        protected override void OnStartup(object sender, StartupEventArgs e)
        {
            DisplayRootViewFor<ShellViewModel>();
        }
    }
} 

Code

var view = GetView() as Window;
var flowchart = (view as ShellView).flowchart;