B4J Question CustomListView with multiple column header

Hey everyone, my brain is not braining as it used to, I have a CustomListView in my B4J app that looks like this;


The header is just a panel I have placed over the CLV with 4 buttons, the problem I am having and don't understand why, is that when I maximize the app window the button headers don't get resized to the same width of the columns of the items in the List, I have tried several things but don't understand what I'm doing wrong, in the picture it looks fine because what I ended up doing is loading the layout I am suing for the items in the CLV into the panel header and setting the header buttons to the same width as the columns in the CLV items, this works when launching the app but if the window gets resized then the header buttons won't adhere to the same sizes, does anyone have a good solution for this, how do you guys add headers when using a CustomListView and how do you guys get around this issue of keeping the header widths the same so they match the widths of the columns in the customlistview. Here's what it looks like when resized


Any ideas?

Thanks All.