diff --git a/lib/features/modeling/behavior/ModelingFeedback.js b/lib/features/modeling/behavior/ModelingFeedback.js
new file mode 100644
index 00000000..e4f20a9c
--- /dev/null
+++ b/lib/features/modeling/behavior/ModelingFeedback.js
@@ -0,0 +1,36 @@
+'use strict';
+
+var is = require('../../../util/ModelUtil').is;
+
+
+function ModelingFeedback(eventBus, tooltips) {
+
+  function showError(position, message) {
+    tooltips.add({
+      position: {
+        x: position.x + 5,
+        y: position.y + 5
+      },
+      type: 'error',
+      timeout: 2000,
+      html: '<div>' + message + '</div>'
+    });
+  }
+
+  eventBus.on([ 'shape.move.rejected', 'create.rejected' ], function(event) {
+
+    var context = event.context,
+        shape = context.shape,
+        target = context.target;
+
+    if (is(target, 'bpmn:Collaboration') && is(shape, 'bpmn:FlowNode')) {
+      showError(event, 'flow elements must be children of pools/participants');
+    }
+  });
+
+}
+
+
+ModelingFeedback.$inject = [ 'eventBus', 'tooltips' ];
+
+module.exports = ModelingFeedback;
\ No newline at end of file
diff --git a/lib/features/modeling/behavior/index.js b/lib/features/modeling/behavior/index.js
index 3d4de43b..82bb3cd4 100644
--- a/lib/features/modeling/behavior/index.js
+++ b/lib/features/modeling/behavior/index.js
@@ -1,7 +1,14 @@
 module.exports = {
-  __init__: [ 'appendBehavior', 'dropBehavior', 'createBehavior', 'removeBehavior' ],
+  __init__: [
+    'appendBehavior',
+    'createBehavior',
+    'dropBehavior',
+    'removeBehavior',
+    'modelingFeedback'
+  ],
   appendBehavior: [ 'type', require('./AppendBehavior') ],
+  dropBehavior: [ 'type', require('./DropBehavior') ],
   createBehavior: [ 'type', require('./CreateBehavior') ],
   removeBehavior: [ 'type', require('./RemoveBehavior') ],
-  dropBehavior: [ 'type', require('./DropBehavior') ]
+  modelingFeedback: [ 'type', require('./ModelingFeedback') ]
 };
\ No newline at end of file
diff --git a/lib/features/modeling/index.js b/lib/features/modeling/index.js
index e5862088..a2128d22 100644
--- a/lib/features/modeling/index.js
+++ b/lib/features/modeling/index.js
@@ -5,6 +5,7 @@ module.exports = {
     require('./rules'),
     require('./behavior'),
     require('diagram-js/lib/command'),
+    require('diagram-js/lib/features/tooltips'),
     require('diagram-js/lib/features/change-support')
   ],
   bpmnFactory: [ 'type', require('./BpmnFactory') ],