Configuration :
Main page with grid, editable.Mode(GridEditMode.PopUp)
This Popup page also have grid with PopUp mode, last Popup page have Treeview with property .Checkboxes(true)
This popup windows newer appear.
To fix the situation have to delete .Checkboxes property from TreeView . As workaround delete Checkboxes and use TemplateId with scripted template and .ToClientTemplate for treeview.
But this situation definitely Kendo ui bug, and have to be fixed