Combining Items (AKA Recipes)

[Palermo1]

I'm kinda having a brain cramp right now. I can't seem to think of the trigger on combineing items (recipes) like they do on Dota Allstars. If anyone could help me out here, i would greatly appreciate it .

-Thanks in advanced

 

[Palermo1]

Nevermind, I finally figured it out . Just took really long time.