WPF

<Window.Resources>

    <Style x:Key="SelectionButton3"
           TargetType="{x:Type Button}">

        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type Button}">

                    <Grid HorizontalAlignment="Stretch"
                          VerticalAlignment="Stretch"
                          ClipToBounds="False">

                        <Grid.RowDefinitions>
                            <RowDefinition Height="75"/>
                        </Grid.RowDefinitions>
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="100"/>
                            <ColumnDefinition Width="*"/>
                        </Grid.ColumnDefinitions>

                        <Border BorderThickness="0,1.5,1.5,1.5"
                                Background="SteelBlue"
                                Height="35"
                                Grid.Column="1"
                                Grid.Row="0"
                                Margin="-31"
                                BorderBrush="DarkSlateBlue">

                            <Border.BitmapEffect>
                                <DropShadowBitmapEffect ShadowDepth="4"/>
                            </Border.BitmapEffect>

                        </Border>

                        <Rectangle Fill="SteelBlue"
                                   Stroke="DarkSlateBlue"
                                   Grid.Row="0"
                                   Grid.Column="0">

                            <Rectangle.LayoutTransform>
                                <RotateTransform Angle="-45" />
                            </Rectangle.LayoutTransform>

                            <Rectangle.BitmapEffect>
                                <DropShadowBitmapEffect ShadowDepth="5"/>
                            </Rectangle.BitmapEffect>

                        </Rectangle>

                        <ContentPresenter x:Name="ContentArea"
                                          VerticalAlignment="Center"
                                          HorizontalAlignment="Center"
                                          Content="{Binding Path=Content, RelativeSource={RelativeSource TemplatedParent}}" />
                    </Grid>

                </ControlTemplate>
            </Setter.Value>

        </Setter>

        <Setter Property="Foreground"
                Value="LightGray" />
        <Setter Property="FontFamily"
                Value="Segoe UI" />

    </Style>

</Window.Resources>

<Grid Margin="50">

    <Button Click="Button_Click"
            Style="{StaticResource SelectionButton3}"
            Width="185">
    </Button>

</Grid>

Hello,

I have a DataGrid. Some of the column are delcared in Xaml and some are dynamic and declared in code. I have a collection of these columns but there is a code where i need to clear all DataGrid columns except the one delcared in code (this is done also using AttachedProperty - i have a collection of columns declared in code and i bind it to an attachedProperty, there i clear the DataGrid columns as i specified).

I want to create anothe Boolean attached Property which i will set in Xaml to true if i want to keep the column .

For this i need to keep a list of all Columns that this boolean attached property is true. How can i do it?

BTW, My Class which handles the AttachedProperties is Static

<Style x:Key="SelectionButton"
        TargetType="{x:Type Button}">

    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type Button}">

                <Grid HorizontalAlignment="Stretch"
                        VerticalAlignment="Stretch"
                        ClipToBounds="False">

                    <Border CornerRadius="7"
                            Opacity="50"
                            BorderBrush="MidnightBlue"
                            BorderThickness=".5"
                            Background="{StaticResource SelectionButtonBackground}"/>
                                
                    <ContentPresenter x:Name="ContentArea"
                                        VerticalAlignment="Center"
                                        Margin="{TemplateBinding Padding}"
                                        Content="{Binding Path=Content, RelativeSource={RelativeSource TemplatedParent}}" />
                </Grid>

            </ControlTemplate>
        </Setter.Value>

    </Setter>
            
</Style>