access codebehind method from resource dictionary in WPF - wpf

Question

I have following grid inside WPF XML file
<Grid Grid.RowSpan="2" >
<Grid.ColumnDefinitions>
<ColumnDefinition />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height = "Auto" />
</Grid.RowDefinitions >
<telerik:RadAutoCompleteBox TextSearchMode = "Contains" Grid.Column= "0" Grid.Row= "0" Name="cmbStyleNo" Margin= "5"
DisplayMemberPath="SAMPLE_ID" ItemsSource="{Binding Styles}"
SelectionMode= "Single" AutoCompleteMode= "Suggest" NoResultsContent= "No Matches" SelectionChanged= "val_SelectionChanged" />
</Grid >
above RadAutoCompleteBox SelectionChanged="val_SelectionChanged" code behind method exist in its code-behind file like follows
private void val_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
...
}
Then I have requirement populate above same grid in another window using resource dictionary. so I copied that grid to that ResourceDictionary like follows
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:samplePrjkt"
xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation">
<ToolBar x:Key="MyToolbar" Height="120">
<!--Template-->
<GroupBox Header="Template" Style="{StaticResource ToolbarGroup}" Margin="3">
<StackPanel Grid.Row="1" Orientation="Horizontal">
<StackPanel Orientation="Vertical" Margin="0,2,0,2">
<Grid Grid.RowSpan="2" >
<Grid.ColumnDefinitions>
<ColumnDefinition />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<telerik:RadAutoCompleteBox TextSearchMode="Contains" Grid.Column="0" Grid.Row="0" Name="cmbStyleNo" Margin="5"
DisplayMemberPath="SAMPLE_ID" ItemsSource="{Binding Styles}"
SelectionMode="Single" AutoCompleteMode="Suggest" NoResultsContent="No Matches" SelectionChanged="val_SelectionChanged"/>
</Grid>
</StackPanel>
</StackPanel>
</GroupBox>
</ToolBar>
</ResourceDictionary>
then once I compile this I'm getting following error
'ResourceDictionary' root element requires a x:Class attribute to
support event handlers in the XAML file. Either remove the event
handler for the SelectionChanged event, or add a x:Class attribute to
the root element.

Answer 1

You need to manually add a code-behind file for the ResourceDictionary and define the val_SelectionChanged event handler in this file.
Please refer to the following link for more information and an example of how to do this:
Is it possible to set code behind a resource dictionary in WPF for event handling?
You basically just create a new class and name it "Dictionary1.xaml.cs" where "Dictionary1" is the name of your resource dictionary XAML file and then you set the x:Class attribute in the XAML file:
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
x:Class="WpfApplication1.Dictionary1"
...