Opens the theme data for a window and its associated class
#include <WinAPITheme.au3>
_WinAPI_OpenThemeData ( $hWnd, $sClass )
| $hWnd | Handle of the window for which theme data is required. |
| $sClass | The string that contains a semicolon-separated list of classes. This parameter may contain a list, not just a single name, to provide the class an opportunity to get the best match between the class and the current visual style. |
| Success: | The handle to the theme. |
| Failure: | 0. |
Search OpenThemeData in MSDN Library.