feat(palette): declare start event as to be selected

* Uses new hints on create start to declare start event as the element to be selected after operation

lib/features/palette/PaletteProvider.js

@@ -86,7 +86,13 @@ PaletteProvider.prototype.getPaletteEntries = function(element) {
       parent: subProcess
     });
 
-    create.start(event, [ subProcess, startEvent ]);
+    var hints = {
+      selectOnFinish: [ startEvent ]
+    };
+
+    create.start(event, [ subProcess, startEvent ], {
+      hints: hints
+    });
   }
 
   function createParticipant(event) {

test/spec/features/palette/PaletteProviderSpec.js

@@ -46,7 +46,7 @@ describe('features/palette', function() {
 
   describe('sub process', function() {
 
-    it('should create sub process with start event', inject(function(dragging, palette) {
+    it('should create sub process with start event', inject(function(dragging) {
 
       // when
       triggerPaletteEntry('create.subprocess-expanded');
@@ -60,6 +60,25 @@ describe('features/palette', function() {
       expect(is(elements[1], 'bpmn:StartEvent')).to.be.true;
     }));
 
+
+    it('should declare start event to be selected', inject(function(dragging) {
+
+      // when
+      triggerPaletteEntry('create.subprocess-expanded');
+
+      // then
+      var context = dragging.context(),
+          data = context.data,
+          elements = data.elements,
+          createContext = data.context,
+          hints = createContext.hints,
+          selectOnFinish = hints.selectOnFinish;
+
+      expect(hints.selectOnFinish).to.exist;
+      expect(hints.selectOnFinish).to.have.length(1);
+      expect(selectOnFinish[0]).to.eql(elements[1]);
+    }));
+
   });
 
 });