minor fixes for custom controls support in wxFileDialog: slightly improve documentation, make variable names more clear and add more WinCE checks (closes #10416)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@58353 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/fldlgcmn.cpp

@@ -151,12 +151,12 @@ wxString wxFileDialogBase::AppendExtension(const wxString &filePath,
     return filePath + ext;
 }
 
-bool wxFileDialogBase::SetExtraControlCreator(ExtraControlCreatorFunction c)
+bool wxFileDialogBase::SetExtraControlCreator(ExtraControlCreatorFunction creator)
 {
     wxCHECK_MSG( !m_extraControlCreator, false,
                  "wxFileDialog::SetExtraControl() called second time" );
 
-    m_extraControlCreator = c;
+    m_extraControlCreator = creator;
     return SupportsExtraControl();
 }