Create a global title object

private: DataVisualization::Charting::Title ^ChartTitle1;

Set the title

	//Add the chart title if this is the first time
	if (ChartTitle1 == nullptr)
	{
		ChartTitle1 = gcnew DataVisualization::Charting::Title();
		ChartTitle1->Name = L"Title1";
		Chart1->Titles->Add(ChartTitle1);
	}

	ChartTitle1->Text = L"Test";		//Changing this at any time will update the charts title