Controls / RadComboBox / How To
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RadComboBox's API gives you the ability to open the DropDown when the control gets focus. In order to enable this behavior you should set the RadComboBox's OpenDropDownOnFocus property to True.
<telerik:RadComboBox x:Name="radComboBox" OpenDropDownOnFocus="True"/>
The default value of the RadComboBox's OpenDropDownOnFocus property is False.
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