comctl32/treeview: Fix test failure on Vista.
diff --git a/dlls/comctl32/tests/treeview.c b/dlls/comctl32/tests/treeview.c
index 7b45626..3091127 100644
--- a/dlls/comctl32/tests/treeview.c
+++ b/dlls/comctl32/tests/treeview.c
@@ -94,6 +94,7 @@
{ WM_PAINT, sent|defwinproc },
{ WM_IME_SETCONTEXT, sent|defwinproc|optional },
{ WM_COMMAND, sent|wparam|defwinproc, MAKEWPARAM(0, EN_SETFOCUS) },
+ { WM_ERASEBKGND, sent|defwinproc|optional },
{ WM_CTLCOLOREDIT, sent|defwinproc|optional },
{ WM_CTLCOLOREDIT, sent|defwinproc|optional },
{ 0 }