Hello Wenrong,

 The Popup within the MindMap example is placed inside the Shape's ControlTemplate and so it is part of the zoom-able visual tree. This is just for the sample, but I would recommend you to do it using the Selection adorner or to modify the Settings Pane control to suits your need. (Actually the Settings Pane is usually added to the ItemInformationAdorner.AdditionalContent. For the next release of the samples we'll also improve this behaviour.
Please let us know if you have further questions. 

Greetings,
Miro Miroslavov
the Telerik team

Hmm... do you have any example of using a selection adorner? My popup control is only specific to each item (rather than to a group of items), that's why I chose to follow the MindMap example in the first place as the ItemInformationAdorner.AdditionalContent seem to be applied to the current selection, be it a single shape or a group of shapes...

Thinking about it, it would work if I can make the ItemInformationAdorner only appear when there is only one item selected.

Is that possible?

Hello Wenrong,

 The ItemInformationAdorner is placed on the same size as the Selection Adorner, meaning that currently the only way to make it appears on one item is to use Single selection instead of multiple. 
So if this is not an option, we have only two options right now - to reverse scale/zoom it (if you go the Mindmap way), which could be somehow hard to do. Or the other option is to change the diagram template and there is a way to add there a new adorner that you can later place only on single shapes. Actually you can do that outside the Diagram - you can handle the Selection event and place a popup (or floating canvas) next to the selected shape. You can easily get the actual position of the Shape and just place your adorning thing there.
In the meanwhile, I'll add a work item so that we must provide an API for easier way of doing this.
Please let us know if any of these solutions work for you, or you need further assistance. 

Greetings,
Miro Miroslavov
the Telerik team

Yup, the last option worked for me. Thanks.

Hi Miro...can you give me sample project to understand how can I control Popup size on diagram without getting it effected by the diagram size of mind map. I am not able to understand from the above answers.

Hi Aakansha,
One way to achieve this is to change the DropDown button in the MindMap shape's styles with a toggle button:
Then handle this toggle button's Checked and Unchecked events and open/close a separate popup (which is not part of the RadDiagram) containing the SettingsPane:
  You'll also have to handle a couple of diagram events to close the Popup - PreviewZoom, PreviewDrag and etc.
I've attached a sample project demonstrating this approach for the MindMap's Root and FirstLevel shapes so could you please examine it and tell us if this is what you're looking for. 


Regards,
Zarko
Telerik