This is behavior is expected. You may inspect with the debugger, set a watch for e.Container
and check what exactly is returned and kept within this variable. You may find below a code, that demonstrates hiding the reminders drop-down field from the advanced form. You can use our demo here
and apply this code to see how that works.
sender, SchedulerFormCreatedEventArgs e)
RadComboBox reminder = (RadComboBox)e.Container.Controls.FindControl(
Hope this will be helpful.
the Telerik team
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