explorerframe: Correctly initialize common controls.

dlls/explorerframe/Makefile.in

 MODULE    = explorerframe.dll
-IMPORTS   = uuid ole32 shell32 user32
+IMPORTS   = uuid ole32 comctl32 shell32 user32
 
 C_SRCS = \
 	explorerframe_main.c \

dlls/explorerframe/nstc.c

@@ -869,6 +869,7 @@ static HRESULT WINAPI NSTC2_fnInitialize(INameSpaceTreeControl2* iface,
     NSTC2Impl *This = impl_from_INameSpaceTreeControl2(iface);
     WNDCLASSW wc;
     DWORD window_style, window_ex_style;
+    INITCOMMONCONTROLSEX icex;
     RECT rc;
     static const WCHAR NSTC2_CLASS_NAME[] =
         {'N','a','m','e','s','p','a','c','e','T','r','e','e',
@@ -882,6 +883,10 @@ static HRESULT WINAPI NSTC2_fnInitialize(INameSpaceTreeControl2* iface,
 
     This->style = nstcsFlags;
 
+    icex.dwSize = sizeof( icex );
+    icex.dwICC = ICC_TREEVIEW_CLASSES;
+    InitCommonControlsEx( &icex );
+
     if(!GetClassInfoW(explorerframe_hinstance, NSTC2_CLASS_NAME, &wc))
     {
         wc.style            = CS_HREDRAW | CS_VREDRAW;