Examples for coding a graphical user interface the MQL4 way?

 

I'm looking to add a graphical user interface to an expert advisor (think: a panel with buttons).

As I'm not experienced with that in the MQL4 language I'd like to check out an existing expert advisor / indicator that is coded in a proper way to learn how to do that the MQL4 way.

In that regard, can you recommend any expert advisor / indicator?

Thanks for any suggestions