Thanks to your valuable feedback, I've updated the status of the feedback item to Approved.

The implementation and the decision whether and when will it be implemented depends on the popularity of this item. If more users vote for it, we'll raise its priority in the backlog.

Best Regards,
Rumen
Progress Telerik

Hi Kasim,

Thank you for the update!

The UX/UI of RadWindow is designed more than 10 years ago and the designers have chosen to show only the restore button when the component is minimized or maximized regardless of the Behaviors settings. This is because RadWindow does not mimic the MS Windows Dialog which work and directly interacts with the taskbar. We do have such an example RadWindow and MDI.

If you'd like to have the maximize button, when the control is minimized and vice versa you can use the OnClientCommand event, check for the enabled behaviors with the get__behaviors() method and set the desired behaviors with the set_behaviors() method.

The set_behaviors() method sets the Behaviors property of the RadWindow . Its argument must be a value or combination of values from the Telerik.Web.UI.WindowBehaviors enum. To set more than one behavior, use "+". Possible values are: None , Resize , Minimize , Close , Pin , Maximize , Move , Reload , Default . For example: oWnd.set_behaviors(Telerik.Web.UI.WindowBehaviors.Move + Telerik.Web.UI.WindowBehaviors.Close).

You can find more details at https://docs.telerik.com/devtools/aspnet-ajax/controls/window/client-side-programming/radwindow-object#methods-that-check-a-condition-or-invoke-a-certain-behavior. 

Regards,
Rumen
Progress Telerik

Hi Kasim,

Straight to the points:

1. The reported behavior while minimized to have a restore button and while maximized to have restore button is by design and if we change it this will be a mass regression in the User Experience of the control.
   
   RadWindow has very flexible client-side API and you can implement your scenario with the use of the following methods:
   
       var oWnd = $find("<%= DialogWindow.ClientID %>");
       oWnd.minimize();
       oWnd.maximize();
       oWnd.restore();
   
   I also tried to reproduce the issue with the random size but without success. Can you please modify the attached project so that it starts to showcase the problem and send it back for examination?
   
   
2. Can you please shed more light on this problem? Do you use RadWindow with ContentTemplate or NavigateURL (the last one uses iframe). Can you please provide a live URL to the problematic page or a runnable example so that we can test this?

Regards,
Rumen
Progress Telerik