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Iam developing an application in VS2008 (with ComponentOne Grid) coding in VB, using which the user can select the columns to be displayed in a grid by clicking on the Checkboxes corresponding to the columns to be displayed within the listbox.

I have run the application but it is giving two errors.

i)Could not create an instance of type'StaticExtension'
ii)Cannot find the type 'VisibilityToBoolConverter'
I am sending the relevant XAML code as well as the VisibilityToBoolConverter.vb code
<XAML>---code---
<Window x:Class="NEW_WpfApplication_20_5_08.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:c1grid="clr-namespace:C1.WPF.C1DataGrid;assembly=C1.WPF.C1DataGrid"
    xmlns:sys="clr-namespace:System;assembly=mscorlib"
    xmlns:local="clr-namespace:NEW_WpfApplication_20_5_08"
    Title="Window1" Height="300" Width="300" WindowState="Maximized">
    <Window.Resources>
        <DataTemplate x:Key="lbItemTemplate">
            <StackPanel Orientation="Horizontal">
                <!-- DataContext is a Column -->
                <CheckBox IsChecked="{Binding Visibility ,
                    Converter={x:Static local:VisibilityToBoolConverter.Default},
                                Mode=TwoWay}"/>
    <TextBlock Text="{Binding Caption}"/>
   </StackPanel>
        </DataTemplate>
    </Window.Resources>
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto" MinHeight="82" />
            <RowDefinition/>
        </Grid.RowDefinitions>
        <ListBox ItemsSource="{Binding ActualOrdinaryColumns, ElementName=dataGrid1}"
   ItemTemplate="{StaticResource lbItemTemplate}" Height="60" VerticalAlignment="Top"
                 SelectionMode="Multiple" />
        <c1grid:C1DataGrid Name="dataGrid1" Margin="0,64,0,0" Grid.RowSpan="2">
            <c1grid:C1DataGrid.Columns>
                <c1grid:Column ColumnName="C1" />
                <c1grid:Column ColumnName="Column2" />
                <c1grid:Column ColumnName="Column3" />
                <c1grid:Column ColumnName="Column4" />
            </c1grid:C1DataGrid.Columns>
        </c1grid:C1DataGrid>
    </Grid>
</Window>

</XAML>
<VisibilityToBoolConverter.vb>---code---
Imports System
Imports System.Collections.Generic
Imports System.Linq
Imports System.Text
Imports System.Windows.Data
Imports System.Windows
Imports System.Globalization

Namespace NEW_WpfApplication_20_5_08
  Public Class VisibilityToBoolConverter
    Implements IValueConverter

    Public Shared ReadOnly [Default] As New VisibilityToBoolConverter()

    Public Function Convert(ByVal value As Object, ByVal targetType As Type, ByVal parameter As Object, ByVal culture As CultureInfo) As Object Implements IValueConverter.Convert
      If TypeOf value Is Visibility Then
        Return CType(value, Visibility) = Visibility.Visible
      Else
        Return Binding.DoNothing
      End If
    End Function

    Public Function ConvertBack(ByVal value As Object, ByVal targetType As Type, ByVal parameter As Object, ByVal culture As CultureInfo) As Object Implements IValueConverter.ConvertBack
      If TypeOf value Is Boolean Then
        Return If(CBool(value), Visibility.Visible, Visibility.Collapsed)
      Else
        Return Binding.DoNothing
      End If
    End Function
  End Class
End Namespace
</VisibilityToBoolConverter.vb>

Could somebody point out the discrepancies.

The converter must be a StaticResource and not code.   Change your Windows.Resources to look like the below code.  You can also remove the "Public Shared ReadOnly [Default] As New VisibilityToBoolConverter()" from your converter, WPF won't be using it.

<Window.Resources>

  <local:VisibilityToBoolConverter x:Key=visibilityToBoolConverter" />

  <DataTemplate x:Key="lbItemTemplate">
    <StackPanel Orientation="Horizontal">
      <!-- DataContext is a Column -->
      <CheckBox IsChecked="{Binding Visibility, Converter={StaticResource visibilityToBoolConverter}, Mode=TwoWay}"/>
      <TextBlock Text="{Binding Caption}"/>
   </StackPanel>
 </DataTemplate>
</Window.Resources>

Karl,  I have changed the code as instructed and ran the program. Still there are two errors shown :

i)The tag 'VisibilityToBoolConverter' does not exist in XML namespace 'clr-namespace:NEW_WpfApplication_20_5_08'

ii)The type 'local:VisibilityToBoolConverter' was not found.Verify that you are not missing and assembly reference and that all assembly references have been built.

Iam getting confused.

You have two namespaces defined.

Remove the "Namespace NEW_WpfApplication_20_5_08" from the converter .vb file.  Just use the default namespace defined in your properties window of the project.

 Rerun the application.

Well you don't become a CodeProjectMVP and Microsoft MVP for nothing.

You two are too kind.