Спасибо но не сработало .пробывал по разному :
так
instance.ActiveTab.DragDrop(100, 27, 200, 27);
так
instance.ActiveTab.FullEmulationMouseMove(260, 265);
instance.ActiveTab.FullEmulationMouseClick("left", "down");
instance.ActiveTab.FullEmulationMouseMove(350, 400);
instance.ActiveTab.FullEmulationMouseClick("left", "up");
так
instance.ActiveTab.FullEmulationMouseDragAndDrop(260,265,350,400);
и так
instance.ActiveTab.MouseClick(260, 265, "right", "down");
instance.ActiveTab.MouseMove(260, 265, 500, 265,true );
instance.ActiveTab.MouseClick(500, 265, "right", "up");