Add ButtonHelpers and the SetButtonDisabledRecursive helper.

Fixes the mess from the other day.

Content.Client/UserInterface/ButtonHelpers.cs

@@ -0,0 +1,31 @@
+using Robust.Client.UserInterface;
+using Robust.Client.UserInterface.Controls;
+
+namespace Content.Client.UserInterface
+{
+    public static class ButtonHelpers
+    {
+        /// <summary>
+        /// This searches recursively through all the children of "parent"
+        /// and sets the Disabled value of any buttons found to "val"
+        /// </summary>
+        /// <param name="parent">The control which childrens get searched</param>
+        /// <param name="val">The value to which disabled gets set</param>
+        public static void SetButtonDisabledRecursive(Control parent, bool val)
+        {
+            foreach (var child in parent.Children)
+            {
+                if (child is Button but)
+                {
+                    but.Disabled = val;
+                    continue;
+                }
+
+                if (child.ChildCount > 0)
+                {
+                    SetButtonDisabledRecursive(child, val);
+                }
+            }
+        }
+    }
+}