I have 2 questions regarding the scheduler's popup
1) how to preselect a value in the combobox ?
2) how to remove the 'none'-item in the combobox ?

I have to change the default value of the resource combobox depending on various factors . (time, day,...)
Is to possible select an item in the combobox in the   function and make it readonly ?

Telerik, this is urgent. We cannot go live if this is not solved.
Our other topics are less important.

We need to select an item programmatically in the resource combobox when the popup opens/opened.
We cannot use the 'defaultValue' in the datasource's model, because the defaultValue is always different.

Possible options  :
1) is there a way to change the defaultValue in de models datasource directly/programmatically with Javascript ?
2) when the popup opens , select een item in the combobox en make the combobox readonly
3) custom validation, when 'none' is selected in the combobox.
    the form closes, when 'none' is selected, no errormessage occurs.

Solved !
the add and save events are suitable for changing combobox selection.