Hi Peter,
Thank you for your interest in Syncfusion products.
By using our Docking manager, we can host several floating window (for different ticket window) with specific placement and specific height and width. Unfortunately, currently we don’t have a feature to set the MinHeight & MinWidth to the floating window. We have added this as a feature request in our FR database and it would be available in our upcoming releases. But we can set the MinHeight & MinWidth to the hosting window (main window) and we can define the Window closing event for specifying whether the window can close or not. We have created a simple sample to demonstrate these functionality. Please find the sample from the link given below.
http://files.syncfusion.com/support/Tools.WPF/7.3.0.20/F89995/main.htmPlease let us know if you have any further queries.
Thanks,
Prabu