If you press CTRL + space, the code completion should show up. If that is not working, then there may be another issue...
I normally start with a few characters of the function I am looking for then use ctrl+space to narrow it down.
Hope that helps anyway.
Mom: So am I going to be an Aunt or Uncle?
Me: An Aunt or an Uncle? I would hope you are going to be an Aunt. (NOTE: I missed this)
Mom: I mean am I going to be a Grandma or a Grandpa.
Me: I would certainly hope you will be Grandma no matter what.
Mom: So does that mean it's a girl?
Me: No, that means no matter what gender it is, you will still be a Grandma.