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Separators
You can use the RadToolBarButton objects that appear in drop-down lists as separators. By using separators, you can divide the items in a drop-down list into two or more groups, making them easier for a user to interpret.
To set a given button as a separator, set its IsSeparator property to True. When IsSeparator is True, the separator is rendered as a horizontal line. Its Text and ImageUrl properties are ignored.
If you set the IsSeparator property to True on a button that is in the toolbar rather than a drop-down list, it has no effect on the appearance of the toolbar. The toolbar appears as if the button did not exist in its Items collection.
The example below shows a drop-down list with a separator:
ASPNET
<telerik:RadToolBar RenderMode="Lightweight" ID="RadToolBar1" runat="server">
<Items>
<telerik:RadToolBarDropDown runat="server" Text="Clipboard">
<Buttons>
<telerik:RadToolBarButton runat="server" Text="Cut" />
<telerik:RadToolBarButton runat="server" Text="Copy" />
<telerik:RadToolBarButton runat="server" IsSeparator="True" Text="This does not appear" />
<telerik:RadToolBarButton runat="server" Text="Paste" />
</Buttons>
</telerik:RadToolBarDropDown>
</Items>
</telerik:RadToolBar>