<TreeView.Resources>
                                <HierarchicalDataTemplate DataType="{x:Type UIDomainModel:UIDeptInfo}"
                                                          ItemsSource="{Binding SubItems}">
                                    <StackPanel Orientation="Horizontal" Margin="0,2,0,2">
                                        <TextBlock Text="{Binding DeptName}" Tag="{Binding DeptId}"
                                                   TextTrimming="CharacterEllipsis" FontSize="14" Margin="8" Foreground="White">
                                            <ToolTipService.ToolTip>
                                                <ToolTip Style="{DynamicResource NormalToolTip}">
                                                    <TextBlock Text="{Binding DeptDescr}" MaxWidth="300" TextWrapping="Wrap" />
                                                </ToolTip>
                                            </ToolTipService.ToolTip>
                                        </TextBlock>
                                    </StackPanel>
                                </HierarchicalDataTemplate>
                            </TreeView.Resources>