This is quite a handy trick that I use when designing or just fiddling around with what I can do with PowerShell WinForms. The last time I used this was to get all the possible colours I could use for my form background, and also check the possible options for my border on a panel.
So if I wanted to find all the possible colours available for my forms background, I would use the following:
[enum]::GetValues([System.ConsoleColor]) Black DarkBlue DarkGreen DarkCyan DarkRed DarkMagenta DarkYellow Gray DarkGray Blue Green Cyan Red Magenta Yellow White
or if I wanted to find out all the possible borders for my panel as I stated above, I would use the following:
[enum]::GetValues([System.Windows.Forms.BorderStyle]) None FixedSingle Fixed3D
Hope this helps, I know this is usually helpful for me. Enjoy!