At the moment only the TelerikTextBox has a Title parameter that I can use to add a tooltip to it.

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ADMIN EDIT

A workaround for the others can be wrapping them in another HTML element whose title attribute you can use.

Here is an example with the checkbox:

<span title="the checkbox title">
    <TelerikCheckBox @bind-Value="@theBool"></TelerikCheckBox>
</span>
@code{
    bool theBool { get; set; }
}

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