Create joining corner and edge objects .......in HFSS

Creating PMLs Automatically
1. Draw a PML base object at the radiation surface.

2. Select the faces of the PML base object to turn into PMLs.

Select only external, planar faces and exclude faces defined as symmetry boundaries.

3. On the HFSS menu, point to Boundaries, and then click PML Setup Wizard.

The PML Setup wizard appears.

4. Select Create PML Cover Objects on Selected Faces.

5. Type the thickness of each layer in the Uniform Layer Thickness text box. You can assign a variable as the thickness value.

Note
The layer thickness cannot be modified directly after PML objects have been created. If you want to be able to modify the thickness, assign a variable as the thickness value.


If you do not assign a value, you can select Use Default Formula to have HFSS calculate a value for you.

6. Optionally, select Create joining corner and edge objects.

Edge and corner PML objects will be created to join adjacent PML surfaces together, ensuring complete coverage. This option is only available if the selected faces are on a bo


above statements is as given in hfss online help but i couldn't find Create joining corner and edge objects option .....
plz help me regarding this