how to implement custom lov button without the standard template.fmb?

 hello,

i am developing a application using oracle forms 10g. i can't use the standard template.fmb because my application does not run in ebs. there comes the problem: i want to implement the lov button function like the template does, such as :
 1. when the text item get focus, lov button display.
 2. when the text item lost focus, lov button disappear.
 3. when scrollbar scrolls, the position of lov button adjust accordingly.
 4. there is only one lov button in one form and the lov button was created dynamicly.

  i found it's so complex to do this.
  anyone can help?