- **Add Step** button adds a new time step;
- **Remove Step** button deletes the current time step.
+**Visualization of field**
+
+When a field is created then its result in data tree looks like following.
+
+.. image:: images/field_steps_tree.png
+ :align: center
+
+.. centered::
+ Result of created field with two steps.
+
+It consists of a Field result object and steps as sub-objects. Only one object can be displayed at one moment: field or one of its step. Field result presentation repersents entities used for the Field definition.
+Step presentation shows field entities and values defined on them. For example a step defined on faces with double values looks like following.
+
+.. image:: images/step_faces_double.png
+ :align: center
+
+Color bar for displayed step is shown only if the setep is selected in **Object Browser**. Desirable parameters of the Color bar (position, number of intervals, text color) can be defined in **Preferences** dialog box.
**TUI Commands**:
.. |shape_group.icon| image:: images/shape_group.png
+.. |plus.icon| image:: images/add.png
+.. |minus.icon| image:: images/reverce.png
+.. |delete.icon| image:: images/delete.png
Group
=====
**Selection by filters**
-If user press this button then following property panel will be opened.
+If user presses this button then following property panel appears.
.. image:: images/selection_by_filters.png
:align: center
.. centered::
Selection by filters property panel
+In this panel:
+
+- **Filters** a panel for added filters.
+
+- **Add new filter** combo box. It contains accessible filters according to the selection mode defined in **Group** property panel. When user selects an item from this combo box a filter item appears in **Filters** panel like in the following example:
+
+.. image:: images/selection_by_filters_added.png
+ :align: center
+
+.. centered::
+ Filters **Horizontal faces** and **On plane** added to the property panel.
+
+Each filter item can be deleted with help of |delete.icon| button. A filter can be reverced with help of toggle button |plus.icon|/|minus.icon|. Also a filter could have input fields in case
+if the filter has arguments.
+
+- **Select** button traverces all objects of a current document and selects entities acceptable by currently defined set of filters. All selected entities will be shown in viewer 3d with
+blue semi-transparent color. Any modification in filters clears current selection.
+
+- **Number of selected objects** shows number currently selected entities.
+
+- **Show only** check box lets to hide all non-selected objects.
+
+**Accept** button in the **Selection by filters** property panel reopens **Group** property panel again and transfers all selected entities to the corresponded list.
+
**TUI Command**:
.. py:function:: model.addGroup(Part_1_doc, [model.selection("EDGE", "Cone_1_1/Face_1&Cone_1_1/Face_2"), model.selection("EDGE", "Cone_1_1/Face_1")])
