Cascading Combobox in extjs

Question

I want to do cascading combobox in extjs. I have to comboboxes

Course combobox

{ 
    xtype : \'combobox\',  
    emptyText : \'         


        

Answer 1

Is it showing a LoadMask the second time you load it?

Use this to override that behaviour:

Ext.override(Ext.LoadMask, {
    onHide: function() {
    this.callParent();
  }
});