need help in oracle developer

i am doing an oracle form with oracle developer 6 ... what i need is to retrive from a field in the database to the combo box or list box in the form ...

i have another question ... i need to have a text field and in the corner of this text field there is an arrow if i pressed this arrow i want to get a pop menue which include data that is retrieved from the database and when i select one of those it will been entered in the text field ...
please i need your help cause i am doing my senior project ..

thanks in advance,
quince,

You need to add one new button or icon with arrow label because the trigger can be written behind button, icon etc not any text. then add when-button-pressed trigger behind the icon and type this command:
GO_ITEM('BLOCK_NAME.ITEM_NAME') ;
DO_KEY('LIST_VALUES');

Here,
BLOCK_NAME = name of Block where the item is placed
ITEM_NAME = name of the item where you want to store value

after finish that, you need to add LOV in the item property where you want to store value.