implement one more method

Change-Id: I3483b2004c0afb8bea651d9eec35d1cbf9aff2a1

sc/inc/conditio.hxx

@@ -392,6 +392,7 @@ public:
     ScConditionalFormat* Clone(ScDocument* pNewDoc = NULL) const;
 
     void            AddEntry( ScFormatEntry* pNew );
+    void RemoveEntry(size_t nIndex);
     void            SetRange( const ScRangeList& rRanges );
     const ScRangeList&  GetRange() const  { return maRanges; }
     // don't use the same name as for the const version

sc/source/core/data/conditio.cxx

@@ -1853,6 +1853,15 @@ void ScConditionalFormat::AddEntry( ScFormatEntry* pNew )
     pNew->SetParent(this);
 }
 
+void ScConditionalFormat::RemoveEntry(size_t n)
+{
+    if (n < maEntries.size())
+    {
+        maEntries.erase(maEntries.begin() + n);
+        DoRepaint(NULL);
+    }
+}
+
 bool ScConditionalFormat::IsEmpty() const
 {
     return maEntries.empty();

sc/source/ui/unoobj/condformatuno.cxx

@@ -323,9 +323,14 @@ void ScCondFormatObj::addEntry(const uno::Reference<sheet::XConditionEntry>& /*x
 {
 }
 
-void ScCondFormatObj::removeByIndex(const sal_Int32 /*nIndex*/)
+void ScCondFormatObj::removeByIndex(const sal_Int32 nIndex)
     throw(uno::RuntimeException, std::exception)
 {
+    SolarMutexGuard aGuard;
+    if (getCoreObject()->size() >= size_t(nIndex))
+        throw lang::IllegalArgumentException();
+
+    getCoreObject()->RemoveEntry(nIndex);
 }
 
 uno::Type ScCondFormatObj::getElementType()