diff --git a/Elwig/Helpers/Utils.cs b/Elwig/Helpers/Utils.cs
index fd2c5f1..8b60b0c 100644
--- a/Elwig/Helpers/Utils.cs
+++ b/Elwig/Helpers/Utils.cs
@@ -65,31 +65,31 @@ namespace Elwig.Helpers {
             return client;
         }
 
-        public static void SetInputChanged(Control input) {
-            var brush = Brushes.Orange;
+        private static void SetControlBrush(Control input, Brush brush) {
             if (input is ComboBox cb) {
                 var border = GetComboBoxBorder(cb);
-                if (border != null)
-                    border.BorderBrush = brush;
+                if (border != null) border.BorderBrush = brush;
+            } else if (input is Xceed.Wpf.Toolkit.CheckComboBox ccb) {
+                var border = GetComboBoxBorder(ccb);
+                if (border != null) border.BorderBrush = brush;
             } else {
                 input.BorderBrush = brush;
             }
         }
 
+        public static void SetInputChanged(Control input) {
+            SetControlBrush(input, Brushes.Orange);
+        }
+
         public static void SetInputInvalid(Control input) {
-            var brush = Brushes.Red;
-            if (input is ComboBox cb) {
-                var border = GetComboBoxBorder(cb);
-                if (border != null)
-                    border.BorderBrush = brush;
-            } else {
-                input.BorderBrush = brush;
-            }
+            SetControlBrush(input, Brushes.Red);
         }
 
         public static void ClearInputState(Control input) {
             if (input is ComboBox cb) {
                 GetComboBoxBorder(cb)?.ClearValue(Border.BorderBrushProperty);
+            } else if (input is Xceed.Wpf.Toolkit.CheckComboBox ccb) {
+                GetComboBoxBorder(ccb)?.ClearValue(Border.BorderBrushProperty);
             } else {
                 input.ClearValue(Control.BorderBrushProperty);
             }
@@ -100,6 +100,11 @@ namespace Elwig.Helpers {
             return toggleButton?.Template.FindName("templateRoot", toggleButton) as Border;
         }
 
+        private static Border? GetComboBoxBorder(Xceed.Wpf.Toolkit.CheckComboBox ccb) {
+            var toggleButton = ccb.Template.FindName("toggleButton", ccb) as ToggleButton;
+            return toggleButton?.Template.FindName("templateRoot", toggleButton) as Border;
+        }
+
         public static IEnumerable<T> FindAllChildren<T>(DependencyObject depObj) where T : DependencyObject {
             if (depObj == null)
                 yield return (T)Enumerable.Empty<T>();
diff --git a/Elwig/Windows/AdministrationWindow.cs b/Elwig/Windows/AdministrationWindow.cs
index 1ba6652..176e4cb 100644
--- a/Elwig/Windows/AdministrationWindow.cs
+++ b/Elwig/Windows/AdministrationWindow.cs
@@ -107,7 +107,8 @@ namespace Elwig.Windows {
                 Utils.ClearInputState(tb);
             foreach (var cb in ComboBoxInputs)
                 Utils.ClearInputState(cb);
-            // TODO ComboCheckBox
+            foreach (var ccb in CheckComboBoxInputs)
+                Utils.ClearInputState(ccb);
             foreach (var cb in CheckBoxInputs)
                 Utils.ClearInputState(cb);
             foreach (var rb in RadioButtonInputs)
@@ -126,8 +127,10 @@ namespace Elwig.Windows {
         }
 
         protected void LockInputs() {
-            foreach (var tb in TextBoxInputs)
+            foreach (var tb in TextBoxInputs) {
                 tb.IsReadOnly = true;
+                tb.Focusable = false;
+            }
             foreach (var cb in ComboBoxInputs)
                 cb.IsEnabled = false;
             foreach (var ccb in CheckComboBoxInputs)
@@ -139,8 +142,10 @@ namespace Elwig.Windows {
         }
 
         protected void UnlockInputs() {
-            foreach (var tb in TextBoxInputs)
+            foreach (var tb in TextBoxInputs) {
                 tb.IsReadOnly = false;
+                tb.Focusable = true;
+            }
             foreach (var cb in ComboBoxInputs)
                 cb.IsEnabled = true;
             foreach (var ccb in CheckComboBoxInputs)
@@ -160,7 +165,8 @@ namespace Elwig.Windows {
                 OriginalValues[tb] = tb.Text;
             foreach (var cb in ComboBoxInputs)
                 OriginalValues[cb] = cb.SelectedItem;
-            // TODO ComboCheckBox
+            foreach (var ccb in CheckComboBoxInputs)
+                OriginalValues[ccb] = ccb.SelectedItems.Cast<object>().ToArray();
             foreach (var cb in CheckBoxInputs)
                 OriginalValues[cb] = (cb.IsChecked ?? false) ? bool.TrueString : null;
             foreach (var rb in RadioButtonInputs)
@@ -180,6 +186,8 @@ namespace Elwig.Windows {
                 tb.Text = "";
             foreach (var cb in ComboBoxInputs)
                 cb.SelectedItem = null;
+            foreach (var ccb in CheckComboBoxInputs)
+                ccb.SelectedItems.Clear();
             foreach (var cb in CheckBoxInputs)
                 cb.IsChecked = false;
             foreach (var rb in RadioButtonInputs)
@@ -200,6 +208,8 @@ namespace Elwig.Windows {
                 return OriginalValues[tb]?.ToString() != tb.Text;
             } else if (input is ComboBox sb) {
                 return OriginalValues[sb] != sb.SelectedItem;
+            } else if (input is CheckComboBox ccb) {
+                return !ccb.SelectedItems.Cast<object>().ToArray().SequenceEqual(((object[]?)OriginalValues[ccb]) ?? Array.Empty<object>());
             } else if (input is CheckBox cb) {
                 return (OriginalValues[cb] != null) != (cb.IsChecked ?? false);
             } else if (input is RadioButton rb) {