Initialise image only if width > 0
process model events after dispatch

This was missing here as we don't inherit Kwf_Controller_Action.
Fixes view cache clearing triggered by model changes in rest controllers
ext4 countries store: sort by name by default
Ext4: add reloadRowOnWrite  for Bindable.Grid

allows automatic reloading parent grid which contains child dependent columns (Like count)
Ext4: allow setting buttons to false without automatic look up