Custom css class not support

[madasamys]

I have using 2.2.3 in our application. In our application we have using multi-select component in many places. Using custom css class for this component. Now the component look likes in our application

Our custom css class

custom-select-choice
{
width:26em;
}

Using firebug to see the applied css for multi-select2 component . My custom css class width is override by default value.

default css

element.style
{
width:10px;
}

But the custom css class working fine in wicket-select2 version 2.1.