Q:

simple obj-c naming question

This question is more to figure out how to look up classes and objects in objective-c but i lack the knowledge to figure out how to look this up so i pose the question here. 
In .Net if i had a MyObject. MyValue the MyValue would be called a property, and I could look this up in MSDN.   In java i would check the javadocs online (and that property would have to be a value).   
With objective-c that is called a ?  and if i wanted to look it up i would look where? 
Example:
//Object.??? 
UIImage.backgroundColor = [UIColor blueColor];

A:

In obj-c it's called a "property" and you would look it up either here or in the developer documentation in Xcode by going to "Help -> Documentation"
I prefer using the built-in documentation, it's super fast and very well organized.