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You can create a group of mutually exclusive checkable items by setting the GroupName property of each item you wish to add to the group. For example, the XAML below will create a group of four mutually exclusive checkable items.
<c1:C1RadialMenu SectorCount="8" >
<c1:C1RadialMenuItem Header="Insert" SectorCount="8" AutoSelect="True" ShowSelectedItem="True" IsCheckable="True" >
<c1:C1RadialMenuItem Header="Insert Left" IsCheckable="True" GroupName="MutuallyExclusiveGroup"/>
<c1:C1RadialMenuItem Header="Insert Above" DisplayIndex="2" IsCheckable="True" GroupName="MutuallyExclusiveGroup"/>
<c1:C1RadialMenuItem Header="Insert Right" DisplayIndex="4" IsCheckable="True" GroupName="MutuallyExclusiveGroup"/>
<c1:C1RadialMenuItem Header="Insert Below" DisplayIndex="6" IsCheckable="True" GroupName="MutuallyExclusiveGroup" />
</c1:C1RadialMenuItem>
</c1:C1RadialMenu>
To create a group of C1RadialMenuItems and only allow one item to be checked at a time, follow these steps:
ItemName.IsCheckable = true;