KDE Run Command doesn't auto complete

This has to be a newbie question, but I admit I don’t know how:

In KDE 4.3.1, how can I get the “Run Command” dialog to auto-complete commands I type in the edit box? For example, if I have a .sh file in my ~/bin folder that is called “myawesomescript.sh” and I type “myawe”, can I get Run Command to expand that to “myawesomescript.sh” and run it?