How to bind to a attribute?

Hello

I have a standard SAP view, in that a TRANSPARENT CONTAINER UI element, well, I need to populate the WIDTH value for that transparent container, as its a standard SAP WD / View / UI element I can't enhance directly in the layout tab, so pls. let us know how we can assign / bind a context attribute to this WIDTH property, currently nothing is populated, I want to have it as 50%. (I already tried SET_WIDTH method of CL_WD_UIELEMENT_CONTAINER and CL_WD_TRANSPARENT_CONTAINER, but no use!)

Dynamically we need to bind the WIDTH / 3 to a context attribute / 4?

Thank you