format - How to display a nested collection with .ps1xml file in powershell -

i have hierarchical object structure this:

public class department {     public string name { get; set; }     public string manager { get; set; }     public employee[] employees { get; set; } }  public class employee {     public string name { get; set;}     public string speciallity { get; set; } } 

how can create custom .ps1xml file let me display department(s) follows:

    department : testers     manager    : p.h. boss  name                       speciallity ----------                 ----------------------------- employee              .net employee           biztalk yet                powershell ...                        ...       department : developers     manager    : wally  name                       speciallity ----------                 ----------------------------- employee              .net employee           biztalk yet                powershell ...                        ... 

the main problem i'm having how can define <view> item selected department, based on tablecontrol, displays department.employees in table control.

i can display employee(s) fine using view:

<view>     <name>employee</name>     <viewselectedby>         <typename>employee</typename>     </viewselectedby>    <tablecontrol>         <tableheaders>             <tablecolumnheader>                 <label>name</label>                 <width>30</width>             </tablecolumnheader>             <tablecolumnheader>                 <label>speciallity</label>                 <width>50</width>             </tablecolumnheader>         </tableheaders>         <tablerowentries>             <tablerowentry>                 <wrap/>                 <tablecolumnitems>                     <tablecolumnitem>                         <propertyname>name</propertyname>                     </tablecolumnitem>                     <tablecolumnitem>                         <propertyname>speciallity</propertyname>                     </tablecolumnitem>                 </tablecolumnitems>             </tablerowentry>         </tablerowentries>     </tablecontrol> </view> 

and can format departments using list format:

<view>     <name>testresultset</name>     <viewselectedby>         <typename>department</typename>     </viewselectedby>     <listcontrol>         <listentries>             <listentry>                 <listitems>                     <listitem>                         <label>department</label>                         <propertyname>name</propertyname>                     </listitem>                     <listitem>                         <propertyname>manager</propertyname>                     </listitem>                 </listitems>             </listentry>         </listentries>     </listcontrol> </view> 

but how add table of employees after department?

i think need make use of <groupby>...</groupby , <control><customcontrol>...</customcontrol></control>

take @ this ps1xml format file discutils module, haven't had chance play myself yet may put on right path.

see help about_format.ps1xml has info, though little light on examples aspects.