The desired functionality is not supported out-of-the-box for both - DropDownList with embedded TreeView and DropDownList with embedded Grid.
Suggestion for embedding Grid in DropDownList is each row of the Grid to be created by using template
. To customize the header of the embedded Grid, the appropriate property is headerTemplate
. The enclosed Dojo
is an example of described implementation.
TreeView nested in DropDownList has been discussed in Kendo Forum. You can find more information in the following thread
, and the example from the thread extracted in Dojo
Another opportunity is if Filter TreeView in Dialog
is fitting your requirements.