Resizing RadRibbonBarGroup with Form resize event

Greetings,

For resizing form's controls, I use this

However, I want to resize the width of  RadRibbonBarGroups, so that there is no empty space (gap) left between elements of the RibbonBarTab. (All  RadRibbonBarGroups should fill up the available space in RibbonBarTab , according to RibbonBarTab's width (form's width))

I would appreciate any help

Thanks