By default, when you add the C1DropDown control to an application, the drop-down arrow, the ToggleButton, is visible. However, if you choose you can hide the drop-down arrow by setting the ShowButton property as in the following steps.
In XAML
To hide the drop-down arrow, add ShowButton="False" to the <Xaml:C1DropDown> tag so that it appears similar to the following:
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                    <XamlC1DropDown Height="30" Name="c1dropdown1" Width="100" ShowButton="False" />  | 
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In Code
To hide the drop-down arrow, add the following code to your project:
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c1dropdown1.ShowButton = false;
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