To update the layouts of its children by a hdivider or vdivider when the user dragging the divider we use livedragging property of the divider control.
By default the container disables this property.
You can configure the DividedBox container to use live dragging by setting the
liveDragging property to
true. With live dragging enabled, the DividedBox container updates its layout as the user moves a divider. In some cases, you may encounter decreased performance if you enable live dragging.
Hope this will help out