Set css from GWT (dynamically) to element with multiple styles associated.

I have an instance of TabLayoutPanel where number of tabs would be set dynamically. Therefore to align tabs to fill whole width of the screen I need to

1) Override gwt-TabTayoutPanel default value width 16384px with auto !important (done);

2) Set width of gwt-TabTayoutPanelTab to proper percentage value (e.g. 2 tabs = 50%. 3 tabs = 33%, 4 tabs = 25% and so on). I have a simple function for that which goes like this (simplified):

Math.floor(getWidgetCount()/100 + "%");

(done)

3) Now here goes my question: how can i set the width of gwt-TabTayoutPanelTab from Java? I bolded Tabs because when i use this.getStyleName(); i got in return gwt-TabLayoutPanel not gwt-TabLayoutPanelTab .

In sum, I can divide my question in two:

-how to access TabLayoutPanelTab css class from GWT?;

-how to set said class width with my dynamically generated percentage number?;

My additional thought: Is GSS can do this?

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