virtual [UMaterialExpression](API\Runtime\Engine\Materials\UMaterialExpression) * CreateNewMaterialExpression ( [UClass](API\Runtime\CoreUObject\UObject\UClass) * NewExpressionClass, const FVector2D & NodePos, bool bAutoSelect, bool bAutoAssignResource, const class [UEdGraph](API\Runtime\Engine\EdGraph\UEdGraph) * Graph )