What a laborious problem this was!
I had set up a DataGrid that resized with the browser, and the user could also resize the column widths. However one column contained a button, and needed to not be resizable by the user or by browser resizing. But in practice, the button was resizing smaller and smaller every time the browser was resized. After many forum postings a solution was suggested(thanks VarioPegged) that is not the most elegant but works:
To recap, three steps must be followed:
1. add a dummy datagridcolumn to the far right of the datagrid that is not resizable and has a width of 0.
2. give the column you don’t want to resize a minWidth value.
3. set up an updateComplete event handler on the datagrid, which resizes the button column and then calls validateNow() on the datagrid.
you can follow the newsgroup post on this issue here.