public void DrawTransitionChooser(AttachItem attach, FD.FlowWindow fromWindow, FD.FlowWindow toWindow, bool doubleSided) {
			
			if (this.drawWindowContent == false) return;

			if (toWindow.IsEnabled() == false) return;
			if (toWindow.IsContainer() == true) return;

			var factor = 0.5f;
			var transitionsContainer = fromWindow;
			var namePrefix = string.Empty;

			if (fromWindow.IsSmall() == true &&
				fromWindow.IsABTest() == true) {

				// is ABTest
				//Debug.Log(fromWindow.id + " => " + toWindow.id + " :: " + attach.index + " :: " + doubleSided);
				transitionsContainer = FlowSystem.GetWindow(fromWindow.abTests.sourceWindowId);
				if (transitionsContainer == null) return;

				namePrefix = string.Format("Variant{0}", attach.index.ToString());
				factor = 0.2f;

			} else {

				if (toWindow.IsSmall() == true) {

					if (toWindow.IsFunction() == false) return;

				}

			}

			if (FlowSystem.GetData().modeLayer == ModeLayer.Audio) {

				if (FlowSystem.GetData().HasView(FlowView.AudioTransitions) == false) return;

			} else {
				
				if (FlowSystem.GetData().HasView(FlowView.VideoTransitions) == false) return;

			}

			const float size = 32f;
			const float offset = size * 0.5f + 5f;

			Vector2 centerOffset = Flow.OnDrawNodeCurveOffset(this, attach, fromWindow, toWindow, doubleSided);

			if (doubleSided == true) {

				var q = Quaternion.LookRotation(toWindow.rect.center - fromWindow.rect.center, Vector3.back);
				var attachRevert = FlowSystem.GetAttachItem(toWindow.id, fromWindow.id);
				
				this.DrawTransitionChooser(attachRevert, toWindow, toWindow, fromWindow, centerOffset, q * Vector2.left * offset, size, factor, namePrefix);
				this.DrawTransitionChooser(attach, fromWindow, fromWindow, toWindow, centerOffset, q * Vector2.right * offset, size, factor, namePrefix);

			} else {

				this.DrawTransitionChooser(attach, transitionsContainer, fromWindow, toWindow, centerOffset, Vector2.zero, size, factor, namePrefix);

			}

		}
		public void DrawTransitionChooser(FD.FlowWindow.AttachItem attach, FD.FlowWindow fromWindow, FD.FlowWindow toWindow, bool doubleSided) {
			
			if (toWindow.IsEnabled() == false) return;
			if (toWindow.IsContainer() == true) return;

			if (toWindow.IsSmall() == true) {

				if (toWindow.IsFunction() == false) return;

			}

			const float size = 32f;
			const float offset = size * 0.5f + 5f;

			if (doubleSided == true) {

				var q = Quaternion.LookRotation(toWindow.rect.center - fromWindow.rect.center, Vector3.back);
				var attachRevert = FlowSystem.GetAttachItem(toWindow.id, fromWindow.id);
				
				this.DrawTransitionChooser(attachRevert, toWindow, fromWindow, q * Vector2.left * offset, size);
				this.DrawTransitionChooser(attach, fromWindow, toWindow, q * Vector2.right * offset, size);

			} else {

				this.DrawTransitionChooser(attach, fromWindow, toWindow, Vector2.zero, size);

			}

		}