the following conditions:
<ul>
-<li>Active view should be VTK view (to choose a point using a preview actor).</li>
<li>The selected field should be defined on the Node entity.</li>
<li>The selected field should have multiple time stamps.</li>
</ul>
-After activation of the action the following dialog is displayed together with
-preview actor in the VTK view:
+After activation of the action the following dialog is displayed (if the current
+view is VTK view, when the preview actor is also displayed):
\image html evolution_dialog.png
<ul>
<li><b>Field</b> - name of the field. This parameter is intended for informational
purpose only and could not be changed by the dialog.</li>
-<li><b>Point</b> - id of the point. It could be set by selection of point on the
-preview actor displayed in the VTK view (note that there is no need to switch to
-the point selection mode manually, because it is turned on automatically during
-the life time of the dialog).</li>
+<li><b>Point</b> - id of the point. It could be set manually or by selection of
+point on the preview actor displayed in the VTK view (note that there is no need
+to switch to the point selection mode, because it is turned on automatically
+during the life time of the dialog).</li>
<li><b>Component</b> - name of the component (scalar mode). This control is
enabled if there are multiple components in the field data.</li>
</ul>