tested version with most of the final functionality. Still a few known issues, like dragging to a row that extends to multiple lines

create_menu_popup.cs

@@ -0,0 +1,79 @@
+using Godot;
+using System;
+using System.ComponentModel.DataAnnotations;
+using System.Linq;
+using System.Linq.Expressions;
+
+public partial class create_menu_popup : PanelContainer
+{
+	[Signal]
+	public delegate void ClearMenuEventHandler();
+	private CardCreateMarginContainer _CardContainer;
+	public CardCreateMarginContainer CardContainer
+	{ get
+		{
+			_CardContainer ??= GetNode<CardCreateMarginContainer>("%CardCreateMarginContainer");
+			return _CardContainer;
+		}
+	}
+	private RowCreateMarginContainer _RowContainer;
+	public RowCreateMarginContainer RowContainer
+	{ get
+		{
+			_RowContainer ??= GetNode<RowCreateMarginContainer>("%RowCreateMarginContainer");
+			return _RowContainer;
+		}
+	}
+	// Called when the node enters the scene tree for the first time.
+	public override void _Ready()
+	{
+	}
+
+	// Called every frame. 'delta' is the elapsed time since the previous frame.
+	public override void _Process(double delta)
+	{
+	}
+
+    public void ShowPopup()
+	{
+		this.GetParentOfType<game>().MenuOpenDisableInteraction();
+		Show();
+	}
+    public void ClosePopup()
+	{
+		Hide();
+		EmitSignal(SignalName.ClearMenu);
+		this.GetParentOfType<game>().MenuClosedEnableInteraction();
+	}
+	public void OkPressed()
+	{
+		var current = GetNode<TabContainer>("%CreateTabContainer").CurrentTab;
+		if (current == 0)
+		{
+			CardContainer.SendCardToGame();
+			ClosePopup();
+		}
+		else if (current == 1)
+		{
+			RowContainer.SendRowToGame();
+			ClosePopup();
+		}
+		else
+		{
+			throw new Exception("No create container visible");
+		}
+	}
+	public void CancelPressed()
+	{
+		ClosePopup();
+	}
+	private void OnVisibilityChange(bool visibility)
+	{
+		// EmitSignal(SignalName.Clear);
+		var tabs = GetNode<TabContainer>("%CreateTabContainer");
+		if (tabs.SelectNextAvailable())
+			tabs.SelectPreviousAvailable();
+		if (tabs.SelectPreviousAvailable())
+			tabs.SelectNextAvailable();
+	}
+}