How to Create Modal or Popup or Dialog in Oracle apex by Java script

Steps...

Step 1.  First create a region and give it a Static ID like random word  modal . Then you can do anything what you need to show in our dialog.
Step 2. Then create a button or any other item to calling a Dynamic Action.
Step 3. Now create a Dynamic Action on this item select Execute Java Script Code as Action.
         and use this code :
   $('#modal').dialog({ "title":"Group","minheight":"60%", "width":"50%", "position":"top" }); 

    Or

 javascript:openModal('modal');

End of this steps  Execute the item. Comment for any query.