How to change the appearance of Calender in WPF DataGrid

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C#

WPF

C#4.0

DataGrid

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I have a DataGrid which have on DateTime column. but i am unable to change the style of the calender.please help me somebody. the code is here

<dg:DataGridTemplateColumn Header="DOB" MinWidth="100" >
                        
                        <dg:DataGridTemplateColumn.HeaderStyle>

                            <Style TargetType="{x:Type dg:DataGridColumnHeader}">
                                <Setter Property="Background" Value="Green"/>
                                <Setter Property="Foreground" Value="Black"/>
                                <Setter Property="FontSize" Value="20"/>
                                <Setter Property="HorizontalContentAlignment" Value="Center" />
                                <Setter Property="Width" Value="Auto"/>
                            </Style>
                        </dg:DataGridTemplateColumn.HeaderStyle>
                                 
                        
                        
                        <dg:DataGridTemplateColumn.CellEditingTemplate>
                            <DataTemplate>                                                                  
                                
                                <dg:DatePicker SelectedDate="{Binding DOB}" SelectedDateFormat="Short"  
                                                CalendarStyle="DynamicResource CalenderControlTemplate"/>                                
                            </DataTemplate>
                           
                        </dg:DataGridTemplateColumn.CellEditingTemplate>
                        
                        <dg:DataGridTemplateColumn.CellTemplate>
                            <DataTemplate>
                                <TextBlock Text="{Binding DOB, StringFormat=d}" 
                                           Foreground="Crimson" HorizontalAlignment="Center" />
                            </DataTemplate>
                        </dg:DataGridTemplateColumn.CellTemplate>
                        
                    </dg:DataGridTemplateColumn>