complex geometrical objects (2D & 3D elements):
<ul>
-<li>\ref fuse_operation_page "Fuse"</li>
-<li>\ref common_operation_page "Common"</li>
-<li>\ref cut_operation_page "Cut"</li>
-<li>\ref section_opeartion_page "Section"</li>
+<li>\subpage fuse_operation_page "Fuse" - creates a shape from two shapes.</li>
+<li>\subpage common_operation_page "Common" - transforms the common part
+of two objects into an independent object.</li>
+<li>\subpage cut_operation_page "Cut" - cuts one shape with
+another. </li>
+<li>\subpage section_opeartion_page "Section" - creates a section between two shapes.</li>
</ul>
There is a general TUI command covering all these operations, which
