Application mouseGrabView is run twice if return true.

**Describe the bug**
A view that use the `mouseGrabView` variable, like `ScrollBarView`, may run the button pressed twice if it return true.

**To Reproduce**
Steps to reproduce the behavior:
1. Go to 'ListViewWithSelection' on UICatalog.
2. Click on down arrow of the 'ScrollBarView'.
3. It scroll down twice.

**Expected behavior**
It should scroll one line at a time with fast click.
