We are using dhtmlGrid v1.2 in our application and now migrating the application to work for IE9 and facing some issue in the header alignment.
We tried to upgrade the newer version of dhtmlGrid but not much success.
Can you please share some details on addressing this issue, without really rewriting the code to use new APIs of dhtmlGrid?
Unfortunately the only way is to update the version of your dhtmlxGrid (2.6v at least).
dhtmlxGrid 1.2 does not support IE9 browser.