[Fixed] MacOSX,Wings3D freeze when hidden Erlang.

[tkbd]

The command which "Hide Erlang", "Hide others" and "Show All " in wings3d menu aren't work correct.
These can be invoke the hotkey each "⌘ + H" and "SHIFT + ⌘ + H".
These are the features that are present in every application of the Mac.

How recreating the bug ?

1. Run Wings3D App.
   
2. Click "Wings3D" menu,and select "Hide Erlang"
   
3. Winsg3D window gone and,it doesn't come back again even tried every means.
   

1. Run Wings3D App.
   
2. Click "Wings3D" menu,and select "Hide others"
   
3. Winsg3D window gone and,don't come back again.
   

Correct behavior
"Hide Erlang" ---- Come back "Wings3D" window if click Wings3D Icon on the Dock.
"Hide Others" ---- Window of all applications except Wings3D is hidden.
"Show All" ---- Displays a window of all was hiding other applications.

OSX 10.11.5
Wings3D 2.0.5