Hi Mark,

Welcome to the forums!

I'm not sure what you mean by "How can i customize this to change the DrowDown to other fields from the managed object". Since this is a relationship within the datamodel you are restricted to what can be used... the option I think that might help is the ItemPicker...

https://github.com/ajshort/silverstripe-itemsetfield

Also in the situation I what the information edittable after it has been selected I use this...
http://www.silverstripe.org/data-model-questions/show/13089#post295584

Hope this helps

Barry

Ahhh....

Where the system is trying to scaffold the drop down it looks for a "Name" field. If you add that then it will look a bit better.

Alternatively - you could redraw the drop down with the right "Name" (within getCMSFields)

$dos = DataObject::get($strDataObjectName);
$map = $dos ? $dos->toDropdownMap('ID','Name') : array(); //change Name in this line
$fields->replaceField('HasOneID',new DropdownField('HasOneID','Label',$map));