Judging from the screenshots, it seems you are using the RadWindow for ASP.NET AJAX while this forum and thread are about the RadWindow for Silverlight control. I would suggest posting in the most relevant forum section to ensure people familiar with the technology you are using see your posts. Here is the RadWindow for ASP.NET AJAX forum: http://www.telerik.com/forums/aspnet-ajax/window
To get back to your question - to hide the Minimize and Maximize buttons of the RadWindow for ASP.NET AJAX, you need to define the Behaviors collection according to your needs. You can see this in action in the following demo: http://demos.telerik.com/aspnet-ajax/window/examples/behaviors/defaultcs.aspx
. You can see how to set them in the code-behind by using the bitwise OR operator (|= to add &= to remove). You can see another example in the documentation: http://docs.telerik.com/devtools/aspnet-ajax/controls/window/getting-started/user-interaction-with-the-window
You can easily to this in the markup by using coma-separated values, e.g.: Behaviors="Resize, Move, Close, Reload, Pin".
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