gistfile1.txt

            <autocompletetextbox:AutoCompleteTextBox 
                DisplayMember="Name" 
                SelectedItem="{Binding SelectedTag, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}" 
                MaxPopupHeight="300" x:Name="AddTagAutoComplete" 
                Text="{Binding AutoCompleteText, Mode=OneWayToSource}"
                Provider="{Binding SuggestionProvider, RelativeSource={RelativeSource AncestorType=UserControl}}" 
                Grid.Column="0" 
                Height="28" 
                Width="150" 
                Watermark="Add tag">
                
                <autocompletetextbox:AutoCompleteTextBox.ItemTemplate>
                    <DataTemplate>
                        <Grid ToolTip="{Binding Name, Mode=OneWay}">
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="Auto" />
                                <ColumnDefinition Width="105"  />
                            </Grid.ColumnDefinitions>
                            <materialDesign:PackIcon VerticalAlignment="Center" Kind="{Binding PgItemType, Converter={StaticResource PgItemTypeToIconConverter}}" Foreground="Black" Opacity=".7" Margin="0,0,2,0" Grid.Column="0" />
                            <TextBlock ToolTip="{Binding Name, Mode=OneWay}" Style="{StaticResource MaterialDesignCaptionTextBlock}" Text="{Binding Name}" Foreground="Black" Grid.Column="1" TextTrimming="CharacterEllipsis" />
                        </Grid>
                    </DataTemplate>
                </autocompletetextbox:AutoCompleteTextBox.ItemTemplate>
            </autocompletetextbox:AutoCompleteTextBox>