X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/3437f881c4270fc52365b507100f36afe837aee5..cc164686f3dc689732395f11210c5bb9a76b6ff2:/src/os2/listbox.cpp?ds=sidebyside

diff --git a/src/os2/listbox.cpp b/src/os2/listbox.cpp
index d23bedc512..968cd9a851 100644
--- a/src/os2/listbox.cpp
+++ b/src/os2/listbox.cpp
@@ -421,8 +421,18 @@ bool wxListBox::IsSelected(
 
     LONG                            lItem;
 
-    lItem = LONGFROMMR(::WinSendMsg(GetHwnd(), LM_QUERYSELECTION, (MPARAM)N, (MPARAM)0));
-    return (lItem != LIT_NONE);
+    if (GetWindowStyleFlag() & wxLB_EXTENDED)
+    {
+        if (N == 0)
+            lItem = LONGFROMMR(::WinSendMsg(GetHwnd(), LM_QUERYSELECTION, (MPARAM)LIT_FIRST, (MPARAM)0));
+        else
+            lItem = LONGFROMMR(::WinSendMsg(GetHwnd(), LM_QUERYSELECTION, (MPARAM)(N - 1), (MPARAM)0));
+    }
+    else
+    {
+        lItem = LONGFROMMR(::WinSendMsg(GetHwnd(), LM_QUERYSELECTION, (MPARAM)LIT_FIRST, (MPARAM)0));
+    }
+    return (lItem == (LONG)N && lItem != LIT_NONE);
 } // end of wxListBox::IsSelected
 
 wxClientData* wxListBox::DoGetItemClientObject(