MyChat Client settings: "Automatically replace text with emoticon images"
When you type the message, MyChat can automatically change smileys codes to their graphic display:
By default, the option is enabled.
Important!
Emoticons autochange is impossible if you insert the text from clipboard (Ctrl+V) or drag it from another program (Drag&Drop). It was made on purpose to not spoil the important text that has letters and punctuations combination similar to emoticons code.