Hi Andy
Thank you for your interest in Syncfusion Products.
It is not possible to change the title of Window control in Code behind on Form2. But you can change the title in client side using clientobjectid. Please use below code snippet to achieve this:
function test()
{
window.parent.sfwindow1.SetTitleText("Modified Title");
}
Please refer the sample in the below link which illustrates the above:
http://websamples.syncfusion.com/samples/Tools.Web/6.3.0.30/Tools_ASP_Window_75072/main.htmPlease try this and let me know if this helps.
Thanks,
Melba