fixed _Close bug

engine/RenderWindow.cpp

@@ -11,7 +11,8 @@ static RenderWindow* gRenderWindow = 0;
 
 //------------------------------------------------------------------------------
 RenderWindow::RenderWindow() :
-	_Initialized(false)
+	_Initialized(false),
+	_Closed(false)
 {
 	glfwInit();
 	gRenderWindow = this;