Binding "open dialogue window" action to a button in WPF.

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C#

WPF

Hi,
I'm using Material Design ToolKit for WPF. I want to open a dialogue popup by pressing a button.

The button and materialDesign:DialogHost are in the same Grid.
The problem is that when I add Command="{x:Static materialDesign:DialogHost.OpenDialogCommand}"> to the button, the button turns pale and gets disabled.
How can I fix this?

What I have tried:

dialogue xaml code:

<pre><materialDesign:DialogHost BorderBrush="{DynamicResource MaterialDesignDivider}">
                    <materialDesign:DialogHost.DialogContent>
                        <Grid Width="300" Height="150" HorizontalAlignment="Center">
                            <StackPanel Orientation="Horizontal" Margin="15">
                                <materialDesign:PackIcon Kind="Folder" Foreground="{StaticResource PrimaryHueMidBrush}" Width="50" Height="50" />
                                <TextBlock Foreground="Gray" Width="200" Margin="15, 5" TextWrapping="Wrap">
                                    Allow application to access data?
                                </TextBlock>
                            </StackPanel>
                            <StackPanel Orientation="Horizontal" HorizontalAlignment="Right" VerticalAlignment="Bottom" Margin="15">
                                <Button Command="{x:Static materialDesign:DialogHost.CloseDialogCommand}" Style="{DynamicResource MaterialDesignFloatingActionButton}" Margin="4" VerticalAlignment="Center">
                                    Deny
                                </Button>
                                <Button Command="{x:Static materialDesign:DialogHost.CloseDialogCommand}" Style="{DynamicResource MaterialDesignFloatingActionButton}" Margin="4" VerticalAlignment="Center">
                                    Allow
                                </Button>
                            </StackPanel>
                        </Grid>
                    </materialDesign:DialogHost.DialogContent>
                </materialDesign:DialogHost>

button code:

<Button VerticalAlignment="Bottom" HorizontalAlignment="Left" Margin="5" Background="#800080" Foreground="AliceBlue" BorderBrush="#800080" Style="{StaticResource MaterialDesignFloatingActionLightButton}" Command="{x:Static materialDesign:DialogHost.OpenDialogCommand}">
    <materialDesign:PackIcon Kind="Pencil" Height="{StaticResource IconSize}" Width="{StaticResource IconSize}" />
</Button>