Restrict Resizing and Dragging in Dashboard Component

Hi, I am currently working on perspective with the dashboard component. I have created widgets with labels and some other components, and they are working perfectly. But I need to restrict one thing in the dashboard component.

Here you can see the image of part of my dashboard component. Here I created 2 widgets in a row. But, i can able to Resizing the widget like i can expand to the next cell even if it has any widget or not.

But really, my requirement is, I don't need to expand and don’t need to move that to the next cell. If I expand the first widget in the image, it overlaps the second widget. I even gave the defaultSize and minSize in the “availableWidgets” properties in the dashboard. But that also is not working.