M4700 screen + 2 monitors

Hello guys ,

I have Dell Precision M4700 with AMD-FirePro-M4000 and i have Advance E-Port II docking station ,

I also have 2 Dell monitors , Dell 24" Wide and Dell 19" standard both connected to DVI in the docking station

I want to the following diplay set :

Laptop screen + extended Screen 24" + extend screen 19" 

I could only make 2 work

Laptop screen + either of the 2 extened monitors

2 mointors extended while laptop screen disconnected

Any idea on what need to do to make it work ???