Click event's target differs depending on whether backgroundColor is set

Steps to reproduce:
1. Run the attached sample FormIssue.mxml
2. Click on Form, just below the last FormItem (Button), Alert is shown that target is Application (FormIssue in this case)
3. Change background of the form by clicking on the button "Click me to change");
4. Now click on the same location on the Form as in step 2, Alert is shown that target is Form (FormIssue.form in this case)

Actual Results:
Event's target is different

Expected Results:
Event's target should be the same and should be Form

Workaround (if any):
None