diff --git a/PROMS/Volian.Controls.Library/ListBoxMulti.cs b/PROMS/Volian.Controls.Library/ListBoxMulti.cs
new file mode 100644
index 00000000..51582552
--- /dev/null
+++ b/PROMS/Volian.Controls.Library/ListBoxMulti.cs
@@ -0,0 +1,44 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+
+namespace Volian.Controls.Library
+{
+    public partial class ListBoxMulti : ListBox
+    {
+        public ListBoxMulti()
+        {
+            Visible = true;
+            SelectionMode = SelectionMode.MultiSimple;
+
+            SelectedIndexChanged += lb_SelectedIndexChanged;
+
+            Disposed += ListBoxMulti_Disposed;
+        }
+
+        public int singleselectedindex { get; set; }
+
+        private void lb_SelectedIndexChanged(object sender, EventArgs e)
+        {
+            ListBoxMulti tmp = (ListBoxMulti)sender;
+
+            if (tmp.SelectedItems.Count == 1 && tmp.singleselectedindex == 0)
+            {
+                tmp.ClearSelected();
+            }
+            else if (tmp.SelectedItems.Count == 1)
+                tmp.singleselectedindex = tmp.SelectedIndex;
+            else
+                tmp.singleselectedindex = -1;
+
+        }
+
+        private void ListBoxMulti_Disposed(object sender, EventArgs e)
+        {
+            SelectedIndexChanged -= lb_SelectedIndexChanged;
+        }
+    }
+}
diff --git a/PROMS/Volian.Controls.Library/Volian.Controls.Library.csproj b/PROMS/Volian.Controls.Library/Volian.Controls.Library.csproj
index 61b2eb86..87305e39 100644
--- a/PROMS/Volian.Controls.Library/Volian.Controls.Library.csproj
+++ b/PROMS/Volian.Controls.Library/Volian.Controls.Library.csproj
@@ -280,6 +280,9 @@
       <DependentUpon>ImageItem.cs</DependentUpon>
     </Compile>
     <Compile Include="LinkText.cs" />
+    <Compile Include="ListBoxMulti.cs">
+      <SubType>Component</SubType>
+    </Compile>
     <Compile Include="PreviewMultiLineRO.cs">
       <SubType>Form</SubType>
     </Compile>
diff --git a/PROMS/Volian.Controls.Library/frmEPAnnotationDetails.cs b/PROMS/Volian.Controls.Library/frmEPAnnotationDetails.cs
index 0f260f1a..44c3cada 100644
--- a/PROMS/Volian.Controls.Library/frmEPAnnotationDetails.cs
+++ b/PROMS/Volian.Controls.Library/frmEPAnnotationDetails.cs
@@ -24,7 +24,7 @@ namespace Volian.Controls.Library
 		private Dictionary<string, CheckBox> _DicCheckBox;
 		private Dictionary<string, ComboBox> _DicComboBox;
 		private Dictionary<string, ComboBox> _DicSingleRO;
-		private Dictionary<string, ListBox> _DicMultiRO;
+		private Dictionary<string, ListBoxMulti> _DicMultiRO;
 
 		private string multiseparator = ",";
 
@@ -35,7 +35,7 @@ namespace Volian.Controls.Library
 			_DicCheckBox = new Dictionary<string, CheckBox>();
 			_DicComboBox = new Dictionary<string, ComboBox>();
 			_DicSingleRO = new Dictionary<string, ComboBox>();
-			_DicMultiRO = new Dictionary<string, ListBox>();
+			_DicMultiRO = new Dictionary<string, ListBoxMulti>();
 			InitializeSpecificControls(currAnn);
 			_MyStepTabRibbon = new StepTabRibbon();
 		}
@@ -138,16 +138,12 @@ namespace Volian.Controls.Library
 				}
 				if (EP.type.ToLower() == "romulti")
 				{
-					ListBox lb = new ListBox();
-					lb.Visible = true;
+					ListBoxMulti lb = new ListBoxMulti();
 
 					List<ROListItem> tmps = EP.getROList(currAnn, false);
 					lb.DisplayMember = "Text";
 					lb.ValueMember = "Value";
-
 					lb.Width = TextRenderer.MeasureText(tmps.OrderByDescending(x => x.Text.Length).First().Text, lb.Font).Width + SystemInformation.VerticalScrollBarWidth;
-					lb.SelectionMode = SelectionMode.MultiSimple;
-					//lb.IsSynchronizedWithCurrentItem = false;
 
 					lb.DataSource = tmps;
 					_DicMultiRO.Add(EP.name, lb);
@@ -170,7 +166,7 @@ namespace Volian.Controls.Library
 					pair.Value.SelectedValue = -1;
 			}
 
-			foreach (KeyValuePair<string, ListBox> pair in _DicMultiRO)
+			foreach (KeyValuePair<string, ListBoxMulti> pair in _DicMultiRO)
 			{
 				pair.Value.ClearSelected();
 				string val = MyConfig.GetValue("EP", pair.Key);
@@ -184,7 +180,10 @@ namespace Volian.Controls.Library
 							pair.Value.SetSelected(pair.Value.FindString(text), true);
 						}
 				}
-            }
+				pair.Value.singleselectedindex = -1;
+			}
+
+			
 		}
 
 		private void FieldStepRTB_Enter(object sender, EventArgs e)
@@ -246,7 +245,7 @@ namespace Volian.Controls.Library
 				}
 				else if (EP.type.ToLower() == "romulti")
 				{
-					ListBox lbcur = _DicMultiRO[EP.name];
+					ListBoxMulti lbcur = _DicMultiRO[EP.name];
 					string newvalues = String.Join(multiseparator, lbcur.SelectedItems.OfType<ROListItem>().Select(item => item.Value));
 					string oldvalues = MyConfig.GetValue("EP", EP.name);
 					if (newvalues != oldvalues)
@@ -287,6 +286,11 @@ namespace Volian.Controls.Library
 				tb.Enter -= FieldStepRTB_Enter;
 			}
 
+			foreach (ListBoxMulti lb in _DicMultiRO.Values)
+			{
+				lb.Dispose();
+			}
+
 			Load -= Form1Load_setDefaults;
 		}
     }