Hello Legionivo, thanks for joining the graphics community.
It seems that plugging in the laptop into a docking station will disable the onboard video ports.
I was able to connect 2 monitors from a Dell Ultrabook HD4600 using the mini Display Port and the HDMI port onboard ports without problems.
I’m using the latest graphics drivers available version 4061 https://downloadcenter.intel.com/Detail_Desc.aspx?DwnldID=24593&lang=eng&ProdId=3712
If you really want to use the docking station, it will be necessary to get some kind of splitter like this one http://www.amazon.com/SMAKN%C2%AE-Black-Analog-Female-Splitter/dp/B00NKWRP4E/ref=sr_1_3?ie=UTF8&qid=1422903534&sr=8-3&keywords=dvi+to+hdmi+splitter&pebp=1422903544396&peasin=B00NKWRP4E
Or get a large docking station with 2 DVIs or HDMI or VGAs.
This is something you can try, however it will allow you to have “clone display” only.
It is important to mention that we haven’t tried these adapters in our systems, so I cannot guarantee you they t will work.