Hide Tab Header

private void HideTabHeader()

        {

            Dispatcher.BeginInvoke(new Action(() =>

            {

                var root = VisualTreeHelper.GetChild(this.tabControlName, 0) as FrameworkElement;

                var headerElement = root.FindName("HeaderDockedElement") as UIElement;

                headerElement.Visibility = System.Windows.Visibility.Collapsed;

            }), System.Windows.Threading.DispatcherPriority.ApplicationIdle);

        }

Multi-line, Editable, Spell Check and Max Length Enable Data Grid Cell (Allow Enter function in Grid Cell) - Telerik

To implement above requirement , can add Text Box Control to GridViewDataColumn

<telerik:RadGridView Name="rgvMessage"

                             Margin="0,10,0,0"

                             VerticalAlignment="Stretch"

                             HorizontalAlignment="Stretch"

                             ShowGroupPanel="False"  

                             AutoGenerateColumns="False"

                             Height="Auto"                                                                                                                   

                             SelectionUnit="Cell"

                             SelectionMode="Single"

                             Grid.Row="2"

                             Grid.ColumnSpan="2">

                <telerik:RadGridView.Columns>

                   

                    <telerik:GridViewDataColumn Header="UserMessage"

                                                                                                   

                                DataMemberBinding ="{Binding UserMessage,Mode=TwoWay}" 

                                            IsReadOnly="False"

                                            Width="*">

                        <telerik:GridViewDataColumn.CellEditTemplate>

                            <DataTemplate>

<TextBox      Text="{Binding UserMessage,Mode=TwoWay}"

AcceptsReturn="True"

MaxLength="{Binding MaxLength}"

SpellCheck.IsEnabled="True"/>

                            </DataTemplate>

                        </telerik:GridViewDataColumn.CellEditTemplate>

                    </telerik:GridViewDataColumn>                   

                </telerik:RadGridView.Columns>

            </telerik:RadGridView>

WPF Controls Slide out-then-in effect

Please Refer Above Document Outline. here i am using Border as a container ,
Ex:

<telerik:RadTabItem Name="PassPreviewTab"

                                Padding="4 1"

                                DropDownContent="Find Record">

                <telerik:RadTabItem.Content>

                    <Border Name="PassPreviewBorder"

                            BorderBrush="White"

                            BorderThickness="1"

                            Margin="10"

                            VerticalAlignment="Stretch"

                            HorizontalAlignment="Stretch"

                            Background="#FFE0F1F8"

                            CornerRadius="10">

                        <Border.Effect>

                            <DropShadowEffect Direction="150" Opacity="0.21" Color="#FF0C0C0C"/>

                        </Border.Effect>

                        <Border.Child>

                            <Grid>

                               // To Do : Add any controls
                            </Grid>

                        </Border.Child>

                    </Border>

                </telerik:RadTabItem.Content>

            </telerik:RadTabItem>

---------------------------------------------------------------------------------------------------------------
Code :

<UserControl.Resources>

        <Storyboard x:Key="SlideIn" >

            <ThicknessAnimation Duration="0:0:.75" Storyboard.TargetProperty="Margin" From="500,0,-500,0" To="0" DecelerationRatio=".9" />

        </Storyboard>

        <Storyboard x:Key="SlideOut">

            <ThicknessAnimation Duration="0:0:.5" Storyboard.TargetProperty="Margin" To="-500,0,500,0" AccelerationRatio=".9"/>

        </Storyboard>

    </UserControl.Resources>

----------------------------------------------------------------------------------------

Code for Slide In Effect for the Border

Storyboard storyboard = Resources["SlideIn"] as Storyboard;

storyboard.Begin(PassPreviewBorder);