Help with class / method layout

[Schnix]

Hello!

I currently have these four classes:
userinterface (basic systemwise layout (css) etc of gui elements)
input (generates e.g. text fields and accepts value, name , id etc)
output (generates text, headers, sub headers etc - method accepts text to be outputed)
uicollection (should collect different methods and lay out an interface... i.e. a login screen - all based on info generated by input and output classes)

Currenty input and ouput extends userinterface for propper formating.

But how should I implement uicollection... it needs to be "extended by both input and ouput". It needs to access all available methods in those classes, which in turn needs to be an extention of userinterface.

How would I go about?

Thanks!

[NogDog]

I'm guessing from the name of the class and the problem described that perhaps UICollection should be using composition/aggregation of the other classes' objects instead of inheritance?

PS: Maybe you're looking at a case for the Composite pattern?

[Schnix]

Thanks! I will check out that web page for pointers :-)