Run-time error: InverseBooleanConverter not found - wpf

Question

I have a problem attempting to follow the advice in:
How to bind inverse boolean properties in WPF?
When I use with ResourceDictionary, it give run-time error. InverseBooleanConverter not found.
XMAL as follows:
<UserControl x:Class="SMTF.MasterDataView"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:SMTF" mc:Ignorable="d" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" d:DesignHeight="466" d:DesignWidth="483">
<UserControl.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="../AppResource.xaml" />
<ResourceDictionary Source="../DefaultStyle.xaml" />
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</UserControl.Resources>
<Grid>
<StackPanel HorizontalAlignment="Left" Margin="200,12,0,0" Name="stkMain" VerticalAlignment="Top" >
<Grid Margin="4">
<ContentControl Visibility="{Binding IsChecked, ElementName=VisibilityToggle, Converter={StaticResource InverseBooleanConverter}}" >
<Border Grid.Column="2" Style="{StaticResource MainBorderStyle}">
<HeaderedContentControl Content="{Binding Path=WorkspaceView}" ContentTemplate="{StaticResource WorkspacesTemplate}" Header="View" Style="{StaticResource MainHCCStyle}"/>
</Border>
</ContentControl>
</Grid>
<Grid DockPanel.Dock="Bottom" Margin="0,2,4,2">
<TextBlock HorizontalAlignment="Right">
<ToggleButton x:Name="VisibilityToggle" Focusable="False" Style="{StaticResource SMToggle}" Command ="{Binding ShowNew}" >
</ToggleButton>
<!--<ToggleButton x:Name="VisibilityToggle" Background="Transparent" Command ="{Binding ShowNew}" >
<Image Source="/Image/Add.png" Width="24" />
</ToggleButton>-->
</TextBlock>
</Grid>
<Grid Margin="4">
<ContentControl Visibility="{Binding IsChecked, ElementName=VisibilityToggle, Converter={StaticResource BoolToVisibility}}" >
<Border Grid.Column="2" Style="{StaticResource MainBorderStyle}">
<HeaderedContentControl Content="{Binding Path=WorkspaceEdit}" ContentTemplate="{StaticResource WorkspacesTemplate}" Header="Configure" Style="{StaticResource MainHCCStyle}"/>
</Border>
</ContentControl>
</Grid>
</StackPanel>
</Grid>
</UserControl>
I'm using the same code provided in the link.
ie:
[ValueConversion(typeof(bool), typeof(bool))]
public class InverseBooleanConverter: IValueConverter
{
#region IValueConverter Members
public object Convert(object value, Type targetType, object parameter,
System.Globalization.CultureInfo culture)
{
if (targetType != typeof(bool))
throw new InvalidOperationException("The target must be a boolean");
return !(bool)value;
}
public object ConvertBack(object value, Type targetType, object parameter,
System.Globalization.CultureInfo culture)
{
throw new NotSupportedException();
}
#endregion
}
in the AppResource XML
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:vm="clr-namespace:SMTF">
<vm:InverseBooleanConverter x:Key="InverseBoolToVisibility" />
.....
.....
</ResourceDictionary>
Thanks in advance
NS

Answer 1

An alternative to converters for style related binding is to use Style.Triggers, the following shows a canvas when checkbox IsChecked = false, which would otherwise require an InverseBooleanConverter.
<Canvas x:Name="Overlay">
<Canvas.Style>
<Style TargetType="Canvas">
<Style.Triggers>
<DataTrigger Binding="{Binding IsChecked, ElementName=MyCheckbox}" Value="True">
<Setter Property="Visibility" Value="Collapsed" />
</DataTrigger>
<DataTrigger Binding="{Binding IsChecked, ElementName=MyCheckbox}" Value="False">
<Setter Property="Visibility" Value="Visible" />
</DataTrigger>
</Style.Triggers>
</Style>
</Canvas.Style>
<Rectangle Canvas.ZIndex="3" Fill="#99333333" Height="25" Stroke="Transparent" Width="293" Canvas.Left="10" Canvas.Top="-25"/>
</Canvas>

Answer 2

The key you are using is not correct. You resource key is InverseBoolToVisibility, while you have used InverseBooleanConverter as key.
Change the resource key to refer to correct resource as
<ContentControl Visibility="{Binding IsChecked, ElementName=VisibilityToggle, Converter={StaticResource InverseBoolToVisibility}}" >
Also your implementation for convereter is wrong. If you want to change the Visibility based on Boolean inverse value update your converter code as:
public class InverseBooleanConverter: IValueConverter
{
#region IValueConverter Members
public object Convert(object value, Type targetType, object parameter,
System.Globalization.CultureInfo culture)
{
if (targetType != typeof(Visibility))
throw new InvalidOperationException("The target must be a boolean");
if(!(bool)value)
{
return Visibility.Visible;
}
return Visibility.Collapsed;
}
public object ConvertBack(object value, Type targetType, object parameter,
System.Globalization.CultureInfo culture)
{
throw new NotSupportedException();
}
#endregion
}