Change to always show the sensor controls. (#526)

sim/visuals/nodes/sensorView.ts

@@ -0,0 +1,19 @@
+/// <reference path="./moduleView.ts" />
+
+namespace pxsim.visuals {
+
+    export abstract class SensorView extends ModuleView implements LayoutElement {
+
+        constructor(xml: string, prefix: string, id: NodeType, port: NodeType) {
+            super(xml, prefix, id, port);
+        }
+
+        public getSelected() {
+            return true;
+        }
+
+        public hasClose() {
+            return false;
+        }
+    }
+}