how to create a custom auto-complete textfield...

i just want to create a textfiled , and want to let it have code auto-complete popup window like below



by searching the sources ,  i find  XDebuggerExpressionComboBox can do it like this ... but i want to custom the code lib for list
and want to custom the render , because i don't want show the red waved line or red word like below




what can i do for it?