Question

I have a window called “DashBoard” window. This window appears after user sucessfully logs in. Now I wanted to open child window called “Memberlist”inside the Dashboard when user select an option from menu item. User should not be able to pullout “Memberlist” window from “Dashboard” window.

DashboardView.xmal (Parent Window)

<Window x:Class="MyProject.DashboardView"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="My Project: Dashboard" Height="600" Width="800" WindowState="Maximized"    
    WindowStartupLocation="CenterOwner">
    <Grid>
    <Menu Height="23" HorizontalAlignment="Left" Name="menu1" VerticalAlignment="Top" 
Width="44">
        <MenuItem Header="_File" >
            <MenuItem Header="View Memberlist…" Command="{Binding 
Path=DisplayMemberlistCommand}" />
</MenuItem>
</Menu>
</Grid>
</Window>

MemberlistView.xaml (Child Window)

<Window x:Class="MyProject.MemberlistView"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:toolkit="http://schemas.microsoft.com/wpf/2008/toolkit"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="View Memberlist" Height="400" Width="806">
<Grid>
    <Grid Height="383" Width="1179">
     <toolkit:DataGrid x:Name="dgMemberlist" 
                      ItemsSource="{Binding Path=MemberList}"
                      AutoGenerateColumns="False" Margin="21,57,422,106"
                      SelectedItem="{Binding Path=SelectedMemberItem, 
UpdateSourceTrigger=PropertyChanged}">
            <toolkit:DataGrid.Columns> 
                <toolkit:DataGridTextColumn Header="Export ID" Width="100"   
Binding="{Binding MemberfullName}" IsReadOnly="True" />

 </toolkit:DataGrid.Columns>
        </toolkit:DataGrid>

</Grid>
 </Grid>
</Window>

DashboardViewModel.cs

private ICommand _displayMemberlistCommand;
public ICommand DisplayMemberlistCommand
    {
        get
        {
            if (_displayMemberlistCommand == null)
                _displayMemberlistCommand = new RelayCommand(a=>DoDisplayMemberlist(), 
p=>true);
            return _displayMemberlistCommand;
        }
        set
        {
            _displayMemberlistCommand = value;
        }
    }


        private void DoDisplayMemberlist() 
        {
            DashboardView dv = new DashboardView();
            MemberlistView mlWindow = new MemberlistView ();
            mlWindow.Owner = Application.Current.MainWindow;
            mlWindow .Show();
        }

Answer 1

Since I did not know the technical term, it took me longer to find solution.
I was refereeing to MDI (Multiple Document Interface). I found very good example with sample code on this URL http://wpfmdi.codeplex.com/