Automatically adjust width of button on ribbon bar

Hi
I have an application using ribbon bar
Caption of buttons on ribbon bar don't have same length so that I have used CXTPControl::SetWidth() to make buttons in ribbon bar same width

The ribbon display well when width of program is enough

But when i resize the main form smaller -> 3 buttons on ribbon bar will be resized like this


There are 3 buttons became horizontal with small icon + caption. But you can see the button don't display full caption anymore because the width i set before is not enough.

My question is how i handle event in which button on ribbon bar is changed style and how i can change the size of button to display all caption automatically.

I can set the maximize width for these button but in normal style (vertical icon + caption) the button is to big.

Is there any other way to handle?