diff --git a/BizHawk.Client.EmuHawk/tools/Lua/Libraries/EmuLuaLibrary.Forms.cs b/BizHawk.Client.EmuHawk/tools/Lua/Libraries/EmuLuaLibrary.Forms.cs
index 0e3f72f859..1be505e439 100644
--- a/BizHawk.Client.EmuHawk/tools/Lua/Libraries/EmuLuaLibrary.Forms.cs
+++ b/BizHawk.Client.EmuHawk/tools/Lua/Libraries/EmuLuaLibrary.Forms.cs
@@ -381,7 +381,7 @@ namespace BizHawk.Client.EmuHawk
 			"newform",
 			"creates a new default dialog, if both width and height are specified it will create a dialog of the specified size. If title is specified it will be the caption of the dialog, else the dialog caption will be 'Lua Dialog'. The function will return an int representing the handle of the dialog created."
 		)]
-		public int NewForm(int? width = null, int? height = null, string title = null)
+		public int NewForm(int? width = null, int? height = null, string title = null, LuaFunction onClose = null)
 		{
 			var form = new LuaWinform();
 			_luaForms.Add(form);
@@ -391,10 +391,26 @@ namespace BizHawk.Client.EmuHawk
 			}
 
 			form.Text = title;
-            form.MaximizeBox = false;
-            form.FormBorderStyle = FormBorderStyle.FixedDialog;
-            form.Icon = SystemIcons.Application;
+			form.MaximizeBox = false;
+			form.FormBorderStyle = FormBorderStyle.FixedDialog;
+			form.Icon = SystemIcons.Application;
 			form.Show();
+
+			form.FormClosed += (o, e) =>
+			{
+				if (onClose != null)
+				{
+					try
+					{
+						onClose.Call();
+					}
+					catch (Exception ex)
+					{
+						Log(ex.ToString());
+					}
+				}
+			};
+
 			return (int)form.Handle;
 		}