[fixed] Freeze application when AutoUV CreateTexture option dialogs closing(OSX).

[tkbd]

I was making a setting for AutoUV CreateTexture Draw Option.
But the following problems encountered in the process.

In AutoUV create texture workflow...
Select "Create Texture" command , and then appear "Draw Options" window.

How to reproduce

1. For example, Select *Wood* and Click an option buton for the *Wood*
2. Click "Dark Rings" color button in the *Wood* dialog
3. Click upper color button in the "Choose Color" dialog
4. Then,"Colors" dialog is appear(This is osx native color picker)
   

At this time, the window that exists are as follows.
For ease of explanation, we call them with A,B,C and D.

• A- "Draw Options"
• B- "*Wood*"
• C- "Choose Color"
• D- "Colors"(OS Native color picker dialog)
  

Dialogs were opened in the order of A-B-C-D.
For example. before "D" window close , you can close "B" and/or "C" at first.(using OK button or Close button)

• 5. you closed B and/or C dialog, Wings3D will becomes freeze depending on the operation.
  

This problem happened on OSX 10.9.5 and OSX 10.10.5
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tkbd