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Jeff
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Jeff asked on 26 Jan 2009, 09:22 PM
I have a few questions regarding the  RadGrid.

I have a combobox as one of my grid columns.  When I click this column I would expect that the current row would change, but it does not.  clicking on a standard text column does cause the row focus to change.  is there a way to get this behavior?

whenever a grid row is modified, the data context for that item needs to be updated. at some point, all changed need to be saved back to the database.  what would be the best way to implement grid updates?  do you have any examples?

thanks,
jeff

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Pavel Pavlov
Telerik team
answered on 28 Jan 2009, 04:18 PM
Hello Jeff,

I have attached a sample application to demonstrate a scenario with a combobox editor and some custom code to handle editing and DB updates.

On the problem of the selection of the row - I think the example behaves as expected. ( I could not reproduce the reported behavior with the row not being selected).

Please let me know if this solution does not fit your scenario so we can think of some workaround.

There is also an online example ( including .cs and .xaml code) here.

Kind regards,
Pavel Pavlov
the Telerik team

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Jeff
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answered on 29 Jan 2009, 11:46 AM
Hi Pavel,

With respect to the sample you provided, why is it necessary to define the content presenter and visual state manager f(in the style) for the grid columns?  Toggling between the normal and editing states for the columns should be handled by the grid without having to explicitly define that behavior should it not? 

Mabe the behavior I'm seeing is caused by how I am defiining the style(s) for my columns.  It seems like  the column(s) where I have assigned a style is consuming the click event and not passing it to the grid which would cause the row focus to change.  Please inspect the following:

<telerik:RadPage x:Class="SilverlightClient.ContactListPage" 
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"   
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    xmlns:toolkit="clr-namespace:Microsoft.Windows.Controls;assembly=Microsoft.Windows.Controls" 
    xmlns:data="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data" 
    xmlns:controls="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data" 
    xmlns:blacklight="clr-namespace:Blacklight.Silverlight.Controls;assembly=Blacklight.Silverlight.Controls" 
    xmlns:telerik="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls" 
    xmlns:telerikDocking="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls.Docking" 
    xmlns:telerikInput="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls.Input" 
    xmlns:telerikMedia="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls.MediaPlayer" 
    xmlns:telerikNavigation="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls.Navigation"     
    xmlns:telerikGrid="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls.GridView" 
    xmlns:telerikGridView="clr-namespace:Telerik.Windows.Controls.GridView;assembly=Telerik.Windows.Controls.GridView" 
    xmlns:xapWorksModel="clr-namespace:SilverlightClient.xapWorksEntities" 
    xmlns:vsm="clr-namespace:System.Windows;assembly=System.Windows" 
    xmlns:local="clr-namespace:SilverlightClient" 
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"   
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"   
    Width="Auto" Height="Auto" mc:Ignorable="d" d:DesignWidth="1200" d:DesignHeight="800" Margin="0,0,0,0">  
 
      
    <telerik:RadPage.Resources> 
         
        <!--Create custom style for the IsPerson column--> 
        <Style x:Key="isPersonCheckboxColumnStyle" TargetType="telerikGridView:GridViewCell">  
            <Setter Property="Template">  
                <Setter.Value> 
                    <ControlTemplate TargetType="telerikGridView:GridViewCell">  
                        <Border HorizontalAlignment="Stretch">  
                            <CheckBox HorizontalAlignment="Center" 
                                       Click="CheckBox_Click" 
                                      IsChecked="{Binding Path=IsPerson, Mode=TwoWay}" /> 
                        </Border> 
                    </ControlTemplate> 
                </Setter.Value> 
            </Setter> 
        </Style> 
 
        <!--Create custom style for the IsAppOwner column--> 
        <Style x:Key="isAppOwnerCheckboxColumnStyle" TargetType="telerikGridView:GridViewCell">  
            <Setter Property="Template">  
                <Setter.Value> 
                    <ControlTemplate TargetType="telerikGridView:GridViewCell">  
                        <Border HorizontalAlignment="Stretch">  
                            <CheckBox HorizontalAlignment="Center" 
                                      Click="CheckBox_Click" 
                                      IsChecked="{Binding Path=IsAppOwner, Mode=TwoWay}" /> 
                        </Border> 
                    </ControlTemplate> 
                </Setter.Value> 
            </Setter> 
        </Style> 
 
        <!--Create custom style for the GenderTypeID column--> 
        <Style x:Key="genderTypeIDComboBoxColumnStyle" TargetType="telerikGridView:GridViewCell">  
            <Setter Property="Template">  
                <Setter.Value> 
                    <ControlTemplate TargetType="telerikGridView:GridViewCell">  
                            <telerikInput:RadComboBox x:Name="theGenderTypeLookup2"   
                                                      Loaded="theGenderTypeLookup_Loaded"   
                                                      DisplayMemberPath="Description"   
                                                      SelectedValuePath="GenderTypeID"   
                                                      DropDownClosed="theGenderTypeLookup2_DropDownClosed" 
                                                      SelectedValue="{Binding GenderTypeID, Mode=TwoWay}" /> 
                    </ControlTemplate> 
                </Setter.Value> 
            </Setter> 
        </Style> 
 
        <Style x:Key="cellstyle" TargetType="telerikGridView:GridViewCell">  
                <Setter Property="Template">  
                    <Setter.Value> 
                        <ControlTemplate TargetType="telerikGridView:GridViewCell">  
                            <Border ToolTipService.ToolTip="{TemplateBinding Content}" 
                                    BorderThickness="{TemplateBinding BorderThickness}"   
                                    BorderBrush="{TemplateBinding BorderBrush}"   
                                    Background="{TemplateBinding Background}">  
                                <Grid> 
                                    <ContentPresenter Name="PART_ContentPresenter"   
                                        Visibility="Visible"   
                                        Margin="{TemplateBinding Padding}"   
                                        VerticalAlignment="Center"   
                                        HorizontalAlignment="Stretch"   
                                        Content="{TemplateBinding Content}"   
                                        ContentTemplate="{TemplateBinding ContentTemplate}"/>  
                                      
                                        <ContentPresenter Name="PART_EditorPresenter"    
                                            Visibility="Collapsed"   
                                            VerticalAlignment="Center"   
                                            HorizontalAlignment="Stretch"   
                                            Content="{x:Null}"/>  
                                </Grid> 
 
                                <vsm:VisualStateManager.VisualStateGroups> 
                                    <vsm:VisualStateGroup x:Name="EditingStates">  
                                        <vsm:VisualState x:Name="Edited">  
                                            <Storyboard> 
                                                <ObjectAnimationUsingKeyFrames Storyboard.TargetName="PART_EditorPresenter" 
                                                           Storyboard.TargetProperty="Visibility">  
                                                    <DiscreteObjectKeyFrame KeyTime="0:0:0" Value="Visible" /> 
                                                </ObjectAnimationUsingKeyFrames> 
                                                <ObjectAnimationUsingKeyFrames Storyboard.TargetName="PART_ContentPresenter" 
                                                           Storyboard.TargetProperty="Visibility">  
                                                    <DiscreteObjectKeyFrame KeyTime="0:0:0" Value="Collapsed" /> 
                                                </ObjectAnimationUsingKeyFrames> 
                                            </Storyboard> 
                                        </vsm:VisualState> 
                                        <vsm:VisualState x:Name="Normal">  
                                            <Storyboard> 
                                                <ObjectAnimationUsingKeyFrames Storyboard.TargetName="PART_EditorPresenter" 
                                                           Storyboard.TargetProperty="Visibility">  
                                                    <DiscreteObjectKeyFrame KeyTime="0:0:0" Value="Collapsed" /> 
                                                </ObjectAnimationUsingKeyFrames> 
                                                <ObjectAnimationUsingKeyFrames Storyboard.TargetName="PART_ContentPresenter" 
                                                           Storyboard.TargetProperty="Visibility">  
                                                    <DiscreteObjectKeyFrame KeyTime="0:0:0" Value="Visible" /> 
                                                </ObjectAnimationUsingKeyFrames> 
                                            </Storyboard> 
                                        </vsm:VisualState> 
                                    </vsm:VisualStateGroup> 
                                </vsm:VisualStateManager.VisualStateGroups> 
                            </Border> 
                        </ControlTemplate> 
                    </Setter.Value> 
                </Setter> 
            </Style>          
    </telerik:RadPage.Resources> 
 
    <Grid x:Name="LayoutRoot" Background="LightYellow">  
        <Grid.RowDefinitions> 
            <!-- the contact buttons goes here --> 
            <RowDefinition Height="Auto"/>  
            <!-- the main content goes here --> 
            <RowDefinition Height="*"/>  
        </Grid.RowDefinitions> 
 
        <Grid.ColumnDefinitions> 
            <ColumnDefinition Width="*" /> 
        </Grid.ColumnDefinitions> 
 
        <!-- define some buttons for CRUD operations --> 
        <StackPanel Orientation="Horizontal" Grid.Row="0" Margin="0,4,0,4">  
            <Button x:Name="NewContactButton"  Height="Auto" Width="Auto" Margin="5,0,0,0" > 
                <ContentPresenter> 
                    <StackPanel Orientation="Vertical">  
                        <Image Source="../Images/VistaCommon/new_document_lined_24.png" Height="24"/>  
                    </StackPanel> 
                </ContentPresenter> 
            </Button> 
 
            <Button x:Name="SaveContactButton"  Height="Auto" Width="Auto" Margin="5,0,0,0" > 
                <ContentPresenter> 
                    <StackPanel Orientation="Vertical">  
                        <Image Source="../Images/VistaCommon/save_24.png" Height="24"/>  
                    </StackPanel> 
                </ContentPresenter> 
            </Button> 
 
            <Button x:Name="DeleteContactButton"  Height="Auto" Width="Auto" Margin="5,0,0,0" > 
                <ContentPresenter> 
                    <StackPanel Orientation="Vertical">  
                        <Image Source="../Images/VistaCommon/delete_24.png" Height="24"/>  
                    </StackPanel> 
                </ContentPresenter> 
            </Button> 
        </StackPanel> 
 
        <!-- THIS IS THE TELERIK GRID --> 
        <telerikGrid:RadGridView x:Name="ContactGrid" Grid.Row="1"   
                                 AutoGenerateColumns="False"   
                                 SelectionChanged="ContactGrid_SelectionChanged">  
            <telerikGrid:RadGridView.Columns> 
                <telerikGridView:GridViewDataColumn  
                    HeaderText="Contact Name" 
                    UniqueName="PartyName" 
                    /> 
                <telerikGridView:GridViewDataColumn   
                   HeaderText="GenderID" 
                    UniqueName="GenderTypeID" 
                    CellStyle="{StaticResource genderTypeIDComboBoxColumnStyle}"/>  
                <telerikGridView:GridViewDataColumn   
                    HeaderText="Is Person" 
                    UniqueName="IsPerson"   
                    CellStyle="{StaticResource isPersonCheckboxColumnStyle}"/>  
                <telerikGridView:GridViewDataColumn   
                    HeaderText="Is App Owner" 
                    UniqueName="IsAppOwner"   
                    CellStyle="{StaticResource isAppOwnerCheckboxColumnStyle}"/>  
                <telerikGridView:GridViewDataColumn   
                    HeaderText="PartyID" 
                    Width="260" 
                    UniqueName="PartyID"/>  
               
                </telerikGrid:RadGridView.Columns> 
        </telerikGrid:RadGridView> 
 
    </Grid> 
</telerik:RadPage> 
 

Here is the code behind file:

Imports System  
Imports System.ComponentModel  
Imports System.Collections.Generic  
Imports System.Collections.ObjectModel  
Imports System.Linq  
Imports System.Net  
Imports System.Windows  
Imports System.Windows.Controls  
Imports System.Windows.Data  
Imports System.Windows.Documents  
Imports System.Windows.Input  
Imports System.Windows.Media  
Imports System.Windows.Media.Animation  
Imports System.Windows.Shapes  
 
Imports Blacklight  
 
Imports Telerik.Windows  
Imports Telerik.Windows.Controls  
Imports Telerik.Windows.Controls.Docking  
Imports Telerik.Windows.Controls.GridView  
Imports Telerik.Windows.Controls.GridView.Rows  
Imports Telerik.Windows.Input  
Imports Telerik.Windows.Controls.MediaPlayer  
Imports Telerik.Windows.Controls.Navigation  
 
 
Imports System.Data.Services.Client  
Imports SilverlightClient.xapWorksEntities  
 
Partial Public Class ContactListPage  
    Inherits Telerik.Windows.Controls.RadPage
#Region "Variable Declarations"  
 
    Dim thePageID As String 
 
    ' create a variable to determine if we have loaded the data  
    Dim dataLoaded As Boolean = False 
 
    Dim theGenderTypes As New ObservableCollection(Of GenderType)
#End Region  
 
    Public Sub New()  
 
        theGenderTypes = App.theGenderTypeCollection  
 
        Resources.Add("MyGenderTypes", theGenderTypes)  
 
        InitializeComponent()  
 
        ' ApplyCellTemplateToColumns()  
 
        ' create an event handler for the grid EditEnded event  
        ContactGrid.AddHandler(GridViewRow.EditEndedEvent, New EventHandler(Of RecordRoutedEventArgs)(AddressOf ContactGrid_EditEnded))  
 
    End Sub 
 
    Private Sub ApplyCellTemplateToColumns()  
 
        Dim cellStyle As Style = CType(Me.Resources("cellstyle"), Style)  
 
        Dim aCol As GridViewColumn  
        For Each aCol In ContactGrid.Columns  
            aCol.CellStyle = cellStyle  
        Next 
    End Sub 
 
    Public Property PageID() As String 
        Get 
            Return Me.thePageID  
        End Get 
 
        Set(ByVal value As String)  
            Me.thePageID = value  
            NavigationIdentifier = "ContactsPage_" & Me.thePageID  
        End Set 
    End Property 
 
    Private Sub ContactListPage_Loaded(ByVal sender As ObjectByVal e As System.Windows.RoutedEventArgs) Handles Me.Loaded  
        If dataLoaded.Equals(FalseThen 
            App.theContactListPage = Me 
 
            Me.NavigationIdentifier = "ContactsPage_" + Me.PageID  
 
            ' bind to the data grid  
            Me.ContactGrid.ItemsSource = App.thePartyCollection  
 
            ' update the status  
            App.theContactsPage.txtStatus.Text = "Contacts loaded" 
 
            dataLoaded = True 
        End If 
    End Sub 
 
 
    Private Sub NewContactButton_Click(ByVal sender As System.ObjectByVal e As System.Windows.RoutedEventArgs) Handles NewContactButton.Click  
 
        ' create a new contact  
        Dim aContact As Party = New Party  
        aContact.IsPerson = True 
 
        Dim g As Guid  
        g = Guid.NewGuid()  
        aContact.PartyID = g  
 
        aContact.IsAppOwner = False 
 
        ' add the contact to the data service context  
        App.theService.AddToParty(aContact)  
 
        ' update the status  
        App.theContactsPage.txtStatus.Text = "Creating new contact" 
 
        ' save the service  
        App.theService.BeginSaveChanges(AddressOf NewPartyDataCompleted, aContact)  
    End Sub 
 
    Private Sub NewPartyDataCompleted(ByVal theResult As IAsyncResult)  
        Try 
            ' stop the save operation  
            App.theService.EndSaveChanges(theResult)  
 
            ' get the contact  
            Dim aContact As Party = CType(theResult.AsyncState, Party)  
 
            ' add it to the observable collection of parties  
            App.thePartyCollection.Add(aContact)  
 
            ' update the status text  
            App.theContactsPage.txtStatus.Text = "party added" 
 
        Catch ex As Exception  
            App.theContactsPage.txtStatus.Text = "Error: " & ex.InnerException.ToString  
        End Try 
    End Sub 
 
    Private Sub SaveContactButton_Click(ByVal sender As System.ObjectByVal e As System.Windows.RoutedEventArgs) Handles SaveContactButton.Click  
        If ContactGrid.CurrentRecord Is Nothing Or ContactGrid.SelectedRecords.Count > 1 Then 
            ' display an error message  
            App.theContactsPage.txtStatus.Text = "Select a single item to save" 
            Return 
        End If 
 
        Try 
 
            Dim i As Integer 
            Dim aContact As Party  
            For i = 0 To App.thePartyCollection.Count - 1  
                aContact = App.thePartyCollection.Item(i)  
            Next 
 
            ' get the selected item  
            Dim selectedContact As Party = CType(ContactGrid.CurrentItem, Party)  
 
            ' update the data service context status for this object  
            App.theService.UpdateObject(selectedContact)  
 
            ' update the status text  
            App.theContactsPage.txtStatus.Text = "Saving the changes" 
 
            ' begin the asyncronous save operation  
            App.theService.BeginSaveChanges(AddressOf SaveContactCompleted, selectedContact)  
        Catch ex As Exception  
            ' display the error  
            App.theContactsPage.txtStatus.Text = "Error: " & ex.InnerException.ToString  
        End Try 
 
    End Sub 
 
    Private Sub SaveContactCompleted(ByVal theResult As IAsyncResult)  
 
        Try 
            ' stop the save operation  
            App.theService.EndSaveChanges(theResult)  
 
            ' update the status text  
            App.theContactsPage.txtStatus.Text = "Changes saved" 
 
        Catch ex As Exception  
            ' display the error  
            App.theContactsPage.txtStatus.Text = "Error: " & ex.InnerException.ToString  
        End Try 
 
 
    End Sub 
 
    Private Sub DeleteContactButton_Click(ByVal sender As System.ObjectByVal e As System.Windows.RoutedEventArgs) Handles DeleteContactButton.Click  
        If ContactGrid.SelectedItem Is Nothing Then 
            App.theContactsPage.txtStatus.Text = "Please select a row to delete!" 
            Return 
        End If 
 
        If ContactGrid.SelectedRecords.Count > 1 Then 
            App.theContactsPage.txtStatus.Text = "Deleting multiple rows is not currently supported!" 
            Return 
        End If 
 
        Try 
            ' get the selected item  
            Dim aContact As Party = CType(ContactGrid.SelectedItem, Party)  
 
            ' delete the party from the data service context  
            App.theService.DeleteObject(aContact)  
 
            ' update the status text  
            App.theContactsPage.txtStatus.Text = "Deleting the party" 
 
            ' begin the asyncronous save operation  
            App.theService.BeginSaveChanges(AddressOf DeletePartyCompleted, Nothing)  
 
            ' remove the object from the collection of parties  
            App.thePartyCollection.Remove(aContact)  
 
        Catch ex As Exception  
            ' display the error  
            App.theContactsPage.txtStatus.Text = "Error: " & ex.InnerException.ToString  
        End Try 
 
    End Sub 
 
    Private Sub DeletePartyCompleted(ByVal theResult As IAsyncResult)  
        Try 
            ' stop the save operation  
            App.theService.EndSaveChanges(theResult)  
 
            ' update the status  
            App.theContactsPage.txtStatus.Text = "Contact deleted" 
        Catch ex As Exception  
            ' display the error  
            App.theContactsPage.txtStatus.Text = "Error deleting contact: " & ex.InnerException.ToString  
        End Try 
    End Sub 
 
 
    Private Sub theGenderTypeLookup_Loaded(ByVal sender As System.ObjectByVal e As System.Windows.RoutedEventArgs)  
        Dim theComboBox As RadComboBox = CType(sender, RadComboBox)  
        theComboBox.ItemsSource = theGenderTypes  
    End Sub 
 
    Private Sub ContactGrid_SelectionChanged(ByVal sender As System.ObjectByVal e As Telerik.Windows.Controls.SelectionChangeEventArgs)  
 
        Dim theCurrentParty As String = CType(ContactGrid.CurrentItem, Party).PartyName  
 
        'Dim changedItemId As System.Guid  
        'changedItemId = CType(ContactGrid.CurrentItem, Party).PartyID  
 
        'Dim changedItem As Party = ( _  
        '    From c In App.thePartyCollection _  
        '    Where c.PartyID.Equals(changedItemId) _  
        '    Select c).Single()  
 
        'App.theService.UpdateObject(changedItem)  
 
        'App.theContactsPage.txtStatus.Text = "Current item is: " & theCurrentParty  
    End Sub 
 
    Private Sub ContactGrid_EditEnded(ByVal sender As ObjectByVal e As RecordRoutedEventArgs)  
        Dim editedContact As Party = CType(ContactGrid.CurrentItem, Party)  
 
        ' update the data service context status for this object  
        App.theService.UpdateObject(editedContact)  
 
        ' update the status text  
        App.theContactsPage.txtStatus.Text = "Saving the changes" 
 
        ' begin the asyncronous save operation  
        App.theService.BeginSaveChanges(AddressOf SaveContactCompleted, editedContact)  
 
    End Sub 
 
 
    Private Sub theGenderTypeLookup2_DropDownClosed(ByVal sender As System.ObjectByVal e As System.EventArgs)  
        Dim editedContact As Party = CType(ContactGrid.CurrentItem, Party)  
 
        ' update the data service context status for this object  
        App.theService.UpdateObject(editedContact)  
 
        ' update the status text  
        App.theContactsPage.txtStatus.Text = "Saving the changes" 
 
        ' begin the asyncronous save operation  
        App.theService.BeginSaveChanges(AddressOf SaveContactCompleted, editedContact)  
    End Sub 
 
    Private Sub CheckBox_Click(ByVal sender As System.ObjectByVal e As System.Windows.RoutedEventArgs)  
        Dim editedContact As Party = CType(ContactGrid.CurrentItem, Party)  
 
        ' update the data service context status for this object  
        App.theService.UpdateObject(editedContact)  
 
        ' update the status text  
        App.theContactsPage.txtStatus.Text = "Saving the changes" 
 
        ' begin the asyncronous save operation  
        App.theService.BeginSaveChanges(AddressOf SaveContactCompleted, editedContact)  
    End Sub 
End Class 


What I was trying to ask (regarding saving the grid changes) was how to batch update all changes made to the grid rather than updating the datasource after each editing event.  Would I need to track the rows that have changed in a seperate collection from the gird source?

Thanks for your assistance.
Jeff
0
Nedyalko Nikolov
Telerik team
answered on 03 Feb 2009, 08:00 AM
Hi Jeff,

Unfortunately mouse events are handled by custom controls within the GridViewCell template.
So you can select items with some additional code within the Click event handler of the nested controls:

Dim selectedContact As Contact = TryCast((DirectCast(sender, FrameworkElement)).DataContext, Contact) 
Me.ContactGrid.FindRecord(selectedContact).IsSelected = True 

You actually can use DataContext and DataRecord directly, without handling the SelectionChanged event.

About your second question - you have to track the changed records in a separate collection. In this thread from our public forum you can find an example how to do this with RadGridView.

Regards,
Nedyalko Nikolov
the Telerik team

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0
D. Omar
Top achievements
Rank 1
answered on 25 Sep 2009, 04:42 PM
Is a cell style still a good way to set a custom editor? I noticed that this is a somewhat ols thread, was CellEditTemplate not there at the time? What is the difference between using CellEditTemplate and the style in the sample application in this thread?
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Nedyalko Nikolov
Telerik team
answered on 28 Sep 2009, 02:53 PM
Hello D. Omar,

Indeed at the time when this forum post has been opened (answered) the CellEditTemplate property was not available.

Generally CellStyle property is designed as an option to change whole GridViewCell behavior and as this property is very powerful can be used as a last resort (because user should implement a lot of functionality and visual states), but the only option if you want to change some visual (theme related stuff). CellEditTemplate and CellTemplate properties come into place when you want to edit just default editor or data presenter with a custom control.

Best wishes,
Nedyalko Nikolov
the Telerik team

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