fix problem with hidden FindInPou dialog with wxPython 3.0 on Windows

FindInPou.IsShown() returned True, but dialog was hidden.
At same time On GNU/Linux with wxPython 3.0 there wasn't such problem.
So it's Windows specific.

     1

{

     2

    "url":"ws://127.0.0.1:8888",

     3

    "realm":"Automation",

     4

    "ID":"wamptest",

     5

    "password":"1234567890",

     6

    "key":"ABCDEFGHIJ"

     7

}