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Hi Sasha,

You can stick something like this in your PropertyGrid.PropertyEditors collection:

<propgrid:DialogTextBoxPropertyEditor PropertyName="TabTitle" />

Then it will show a TextBox with a dialog box button.  This button fires a PropertyGrid.ShowPropertyDialogCommand when it is clicked, so just add a command binding to that on your containing view and handle the dialog show there.

this.CommandBindings.Add(new CommandBinding(PropertyGrid.ShowPropertyDialogCommand, OnShowPropertyDialogExecute));

Im sory, I didnot understand where should I add this line:

<propgrid:DialogTextBoxPropertyEditor PropertyName="TabTitle" />

 In my Xaml file in ResourceDictionary I have style with converter, to expand one category:

 <Style TargetType="{x:Type propgrid:PropertyGridDataAccessorItem}">
                <Style.Triggers>
                    <Trigger Property="DataAccessorType" Value="Category">
                        <Setter Property="IsExpanded">
                            <Setter.Value>
                                <MultiBinding>
                                    <MultiBinding.Converter>
                                        <local:ExpandedCategoryConverter />
                                    </MultiBinding.Converter>
                                    <Binding Path="DisplayName" RelativeSource="{RelativeSource Self}"/>
                                    <Binding Path="ViewModel" RelativeSource="{RelativeSource Mode=FindAncestor, AncestorType=Window}"/>
                                </MultiBinding>
                            </Setter.Value>
                        </Setter>
                    </Trigger>
                </Style.Triggers>
            </Style>

 and here place where I create propertyGrid: 

<DockPanel HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Dock="Bottom">
  <propgrid:PropertyGrid x:Uid="PropertiesUserControl" x:Name="PropertiesUserControl"  IsSummaryVisible="True" 
       AreNestedCategoriesSupported="True" IsAsynchronous="True" IsEnabled="True" AreDefaultSortDescriptionsEnabled="False" 
       AreCategoriesAutoExpanded="False" SelectedObject="{Binding SelectedObject}">      
  </propgrid:PropertyGrid>
</DockPanel>

 And properties to expand I did as in my first question. But where to insert a line that you mentioned I can't figure out

You would do it in the collection I mentioned, like:

<propgrid:PropertyGrid ...>
 <propgrid:PropertyGrid.PropertyEditors>
  <propgrid:DialogTextBoxPropertyEditor PropertyName="TabTitle" />
 </propgrid:PropertyGrid.PropertyEditors>
</propgrid:PropertyGrid>

Thank you for your help