Calculates the original size of the part defined by a visual style
#include <WinAPITheme.au3>
_WinAPI_GetThemePartSize ( $hTheme, $iPartID, $iStateID, $hDC, $tRECT, $iType )
| $hTheme | Handle to a window's specified theme data. |
| $iPartID | The part part to calculate the size of. |
| $iStateID | The state of the part. |
| $hDC | Handle to a device context to select fonts into. |
| $tRECT | $tagRECT structure that contains the rectangle used for the part drawing destination. |
| $iType | The type of size to retrieve. This parameter can be one of the following values. $TS_MIN $TS_TRUE $TS_DRAW |
| Success: | $tagSIZE structure that contains a dimensions of the specified part. |
| Failure: | Sets the @error flag to non-zero, @extended flag may contain the HRESULT error code. |
Search GetThemePartSize in MSDN Library.